Skip the auto shop - Our mechanics make house calls

Q: Ocassioanl stalling at idle, RPMs fluctuate at idle - 1995 Chevrolet K2500 Suburban

asked by on

I have no problem starting the vehicle after it sat for the night, when the engine is still cold. When I drive it, park it for a short while and then get back to continue driving, I would be able to start it right away. However, the truck would turn off as soon as the key is back into the run position. So I have to keep it running for a while, and hold the fuel longer. Then the RPM would start fluctuating a lot and it would continue until I put it in gear. The idling would jump up, then drop down so much that it seems that the vehicle would stall. There are no more problems after I have put it in gear and accelerated. So, it stalls only when I try to start it after it was driven and sat for a short time. During idling, the RPMs would ocassionally go around 2900 and then gradually become normal. The repairs I've done so far include the replacement of the spark plugs, fuel filter and injectors. Also, I had the distributor, fuel pump and coil replaced. All the parts are new. Do you have any idea what might cause the stalling?

You either have a leaking injector that is dripping fuel after you shut off the engine and causing a flooded engine and will cause the hard start and erratic running conditions. You could also have a fuel pressure regulator or purge valve that is leaking. The fuel pressure regulator will need to be tested with a gauge and the purge valve tested with a vacuum pump and hose to see if it is leaking vapors when the engine is off. The purge valve may be leaking too much vapor and would show up after running and shutting it off or after getting fuel. The excessive vapors will flood the engine and cause the hard start or stall, and rough or high idles. If you would like to have this checked, a qualified pro from YourMechanic can come to your car’s location to diagnose the stalling problem and high idle to ensure proper repair.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  • Home
  • Questions
  • Ocassioanl stalling at idle, RPMs fluctuate at idle - 1995 Chevrolet K2500 Suburban

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Truck won't run like it used to

Hi, thanks for writing in. Believe it or not, this happens quite a bit when people swap OEM air filters to K&N or other products. It has nothing to do with the aftermarket part however. The P-0104 OBD-II error code...

Q: 4 wheel drive will not engage.

Hello. There appears to be three different locations for the control module depending on the chassis. The 4wd control module will either be found behind a kick panel on the passenger side, inside the dash, accessible by opening the glove...

Q: I put in a new starter and battery and my Jeep will not start. Please help me get my Jeep to start.

Hi there. Check to see if the wiring to the battery and the starter are tight and clean. A bad connection will cause a no start situation. If the battery cables and wires are all tight and clean, then go...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...