Skip the auto shop - Our mechanics make house calls

Q: Bucking and sputtering upon startup on 1999 GMC K1500 Suburban

asked by on

My car has 180,000 miles. It developed some starting problems. It doesn't matter if I start it when the engine is cold or warmed up, it would start bucking and sputtering. This would last in the first several minutes upon startup. It would keep running like this and if I attempted to accelerate fast, the car would start revving high. After several minutes of running rough, it would get back to normal. Each startup is like this. What might be the cause of this problem?

Hello. Thanks for writing in about your 1999 GMC K1500 Suburban. It is likely a faulty/dirty idle air control valve, a faulty mass airflow sensor or bad coil pack causing your issue. If you would like to have this looked at, a certified professional from YourMechanic can come to your car’s location to inspect the starting issue and let you know what should be done.

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!

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: After alternator is replaced, battery light still comes on

Hello. It is possible that the problems that you have been experiencing with the bad alternators have damaged the battery causing it to be weak. This would make the Battery Light come on. It is also possible that there is...

Q: Transmission engine comparability

Hey there. As long as the engine you have currently bolted to the 700R4 is NOT a 4 cyl or V6, it should bolt up to the TH400. TH350s, TH400s (except those in a Jeep), and 700R4s (except as noted...

Q: Ran out gas and put gas back in but car still won't start

Hello. When the vehicle is completely drained of gas, the pump and related fuel system components can be stressed to the point of failure. This will cause the vehicle to not start Start by checking the easy components like the...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.