Idles high, hesitates or stalls when attempting to accelerate

Tiny
KELB1911
  • MEMBER
  • 1995 CHEVROLET MONTE CARLO
  • 3.1L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 186,000 MILES
Car cranks fine. Ran and drove perfect until about a month ago. Now it loses acceleration on inclines, and when it comes to a complete stop (ie stoplight/stop sign) when I press the gas pedal, it hesitates and stalls out.

I have cleaned the throttle body, replaced IAC, TPS, MAP sensor, coolant temperature sensor, and fuel filter. No change.

Any help or assistance with this issue will be greatly appreciated.
Thursday, July 2nd, 2020 AT 1:05 PM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
I suspect you have an issue with the purge valve. If these get stuck open then it can cause this issue. Basically the engine runs to rich and it will do what you are seeing.

I would remove the purge valve and inspect it to see if it looks like it has some charcoal build up in it. If it does then I bet you have raw fuel in the charcoal canister which breakdown the charcoal and causes the valve to stick.

Let me know what you find and we can go from there. Thanks
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Thursday, July 2nd, 2020 AT 7:05 PM

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