Idle, gear shifting and accelerating problems

Tiny
BAD INVESTMENT
  • MEMBER
  • 1994 CHEVROLET VAN
  • 5.7L
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
Since I took my car for a ac charge at a (auto shop and transmission). It would stall at every red light when I let off the gas. When I took it back they put in a used idle air control valve for free that worked for about a day. Symtoms remain the car would not start unles I floor it and keep it reving high would stall so I bring it back and they say they must rebuild the carberator for $240 and this will surely fix my problem and it did not it would then not accelerate properly when I press the gass as if I let off as I let off it will slowly accelerate so I take it back to the shop they replace the spark plugs that helps a little for a day the next day they replace the spark plug wires that helps for another day they I replaced the that worked for a few hours then I changed the distributor cap that bade it run exelent for atleast an hour and good for the whole day then now it is idling very high then low continuously will not stay started very difficult to accelerate having a hard time shifting gears will rev very high before it shifts unles I let off the gas then it will it is a automatic. Its odd how all these replacements helped for a very short time. The car did stall while reversing often before all of this and would rarely stall while parked
one last thing it feels like the engine power is cut in half when I switch the ac on and every thime the shop would leave the ac on before telling me to test drive. Any ideas most probable first? Sure appreciate it.
I believe the van is a 8 cyl but surely not a v an its a 1994 g20 sportvan
Wednesday, June 4th, 2014 AT 10:19 AM

1 Reply

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
I agree pretty much with the shop. Plus, I would check cylinder compression. If compression is no good, you may never get it to run correctly? If you don't have decent engine vacuum, your going to have problems. I would have given it a full tune-up. 02 sensor/s are part of a tune-up. Surely they checked for applicable trouble codes?

A rough idle could be caused by a leak of some kind, fuel--egr--vacuum, something of that nature.

Surely they used a scanner on it that showed live engine data. Did they see any signals that looked wrong?

Unless you can do a little testing on your own vehicle, I'm not sure how to help?

I haven't looked at your tranny system, if poor vacuum is applicable, yes, it could cause shifting problems.

Can you check if the fuel system is running rich or lean? I could go on and on. Sorry I couldn't give you the most likely? Just speaking for myself, too many possible issues.
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Wednesday, June 4th, 2014 AT 11:31 AM

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