I have a 1990 Chevy Van with a 350 - 5.7 - When cold, It fires up after about the fifth crank but runs very rough and wants to die. The only way to keep it running is to work the gas pedal. Then when putting it into reverse or drive it dies quickly. I have to push on the brakes and the gas pedal at the same time to get the van moving. The RPM also raises and lowers by itself. When giving some gas it it gets louder, hesitates and has no power. If I floor it, it hesitates for a second then kicks down to low gear and takes off for a second or two then the power begins surging. It don't back-fire - It shakes and idles rough. Dies while idling (mainly when it is in gear). Sometimes after warm up while parking the van then shifting out of drive into park it quickly and suddenly dies. Sometimes it runs great until I turn on the lights then it begins acting up. Throttle Body has the (two) fuel injectors and a separate coil. I replaced the Dist Cap, Rotor, Spark Plugs, Spark Plug Wires. I don't know, it has to be something simple. But I am stumped!
SOURCE: 1995 Chevy silverado with a
I have experienced this problem on similar vehicles. You should try and replace the coolant temp sensor. If it is not reading the correct temp to the ecm, it will not get the right fuel map. Also, the cts will not always throw a code.
SOURCE: 1995 Chevy G20 idles but won't run
maybe fuel filter needs to be changed. If it is a quadrajet carb check at inline filter?
SOURCE: 1992 gmc chevy 350 wont idle when warm
This could be a number of things but i think that your problem sounds like a vacuum leak or an EGR problem. Try listening for leaks and try un-plugging the EGR solenoid valve one time.
SOURCE: 91 Jeep wrangler New everything idles rough, no Power then dies
you check for miss how is compression
SOURCE: Shakes while idling and sometimes stalls.
check for minor vacuum leak and map sensor,pcv,egr valve
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