Hi there sounds like idle air control valve failure. Or also known as fast idle valve. I would suggest locate and clean. If that doesn't help then replace it and you should be good to go
SOURCE: will not hold idle when in drive or reverse 1991 S10 Blazer
Well Boys
If I tell you how to fix the S10 Problem are you going to send me $10.00Regard.
Regards,
SOURCE: 2000 silverado 4.8 v8 runs bad when it is cold out side.
Try replacing the coolant temperature sensor for the injection system.
SOURCE: 1987 chevy S10 engine idle problem
relace the throtle air idle valve.The temp switch will allso cause this problem.
SOURCE: 95 impala lt1 will stall when warm and not start
On the plus side, when you are finished, you will have a new control system! On the negative side, you just spent more money on parts than if you'd have just taken it to a dealer! I hope you tested those components and determined they have failed. Any codes?
Seems like the only thing you missed is the coil and the temp sending unit (just for laughs, unplug it and see if it stalls out at the same time), or possibly a security system malfunction. Get a decent volt/ohmeter and a vehicle specific manual such as chiltons or haynes. Do some testing, hot and cold and compare your results.You need to determine what is shutting down (fuel, spark or both) Once you develop a "picture" regarding what is happening, you will be more able to find a solution. I can't give you a "fix" on this one only because to properly identify the problem, I'd need to do the same testing I suggested.
good luck
SOURCE: engine tune complete..map ,iac,tps relaced..start
Cold starts and untill engine reaches operating temp, The coolant and intake air temp adjust the fuel like the choke in older vehicles. The MassAir Flow sensor adjusts the fuel by measuring the velocity and density of the intake air for proper air/ fuel ration. The MAF can be cleaned with CRC electrical spray cleaner, Do not rub or brush this sensor. It is as expensive as it is fragile. Spray was it as thoroughly as possible. The spray evaps fast so no compressed air. It is located in the intake ducting in a metal section of tubing. make sure your air filter is clean and leak free. Good Luck....Ned
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