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My 92 astro runs good when firt started then starts missing and sputtering when it warms up.when u hit the gas hard when driving it starts surging between running smooth and sputtering
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Sounds like possibly more than on problem, crankshaft position sensor, or ignition module likely on starting prob which maybe affecting shifting due to hard code in ecm, or shift prob could be shift solenoid in valve body of transmission. Both parts readily available from local parts store
My 1990 S10 pick-up had a similar problem too. It would start up fine (while the engine was cold) then once the engine warmed up it would idle very rough, sputter, and even stall out. My grandpa and I found what was wrong finally. The fuel distributor had been cracked, so when the engine warmed up it would miss (giving either too much or not enough fuel). So I recommend that you check that. Hope this helps.
This isn't answer but a couple of things to check or do. First has fuel filter been replaced? Start car and put it in gear. HOLD Brake and Give it gas while still holding brake hard!!!! Doess it buck or miss fire? You said it ran bad to highway. Explain Please !!! will answer after you reply.
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