Skip the auto shop - Our mechanics make house calls

Q: High idle, deiseling(sometimes) jumping in gears and choke light stays on.

asked by on

I picked up my 85 chevy g20 van from having the transmission rebuilt 2 days ago and from the moment i picked it up it has been idling high, jumping into gears, deiseling (not all of the time just sometimes) and the choke light stays on. It did not have these problems before. Also there is a wire at one of the connectors on the carb that is badly frayed (i will include a pic in the comments). The engine is a 305 v8 5L and has a 4bbl quadrajet carb. I am stumped, any ideas on the cause?

My car has 200000 miles.
My car has an automatic transmission.

Hello. If all of these issues appeared after you took the vehicle into a shop then I would return to that shop and have them address the problems. It may be possible that the issues developed as a result of the work that they did. From what you describe it would appear that your vehicle is experiencing a variety of symptoms, which can be caused by a wide variety of issues ranging from problems with the carburetor or fuel system, to issues with an engine sensor. If the choke light is staying on then that could be a sign that the choke mechanism is having an issue, perhaps due to a problem with the carburetor. If there is a frayed wire it could be possible that the issues you are experiencing could be related to an electrical fault it is causing. I would recommend checking with the shop to see how they may be able to help you, or have a professional technician look at the vehicle.

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
  • High idle, deiseling(sometimes) jumping in gears and choke light stays on.

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: Gear oil leak.

Hello. Pinion bearing seals can leak due to normal wear or as a result of excessive pinion bearing play. A growling sound can indicate a worn pinion bearing as well. If the noise changes during acceleration, the cause is most...

Q: Truck starts emits a fire compression sound, then revolutions to max with stuttering and turns off. 2004 Chevrolet Silverado 1500

Hi - I suspect the throttle mechanism, specifically the throttle position sensor, has been damaged, or possibly re-installed incorrectly during your other repairs. I would recommend an inspection of the throttle system by a mobile, professional mechanic, such as one...

Q: The pulley is making a rattling, ding ding ding sound occasionally when I'm driving, how do I fix this?

Hello: In most cases, this sound is an indication of a loose pulley; which might be caused by worn out center bearings or misalignment. The best way to attempt to fix this is remove the belts, then try to wiggle...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.