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What could be causing my 3.8 to stall when engine is cold or seem to be "choking out?"

Tiny
CHELSEAROSE_1
  • MEMBER
  • 1994 PONTIAC TRANSPORT
  • 127,000 MILES
Check engine light is on intermittently, corresponds to problem. Sometimes it stalls out or tries to choke out when engine is cold. Sometimes it will restart right away. Other times it has to sit awhile. Sometimes accelerating to "blowout" the problem works and it will straighten out. Other times despite acceleration, it will stall or it will not exceed 25-30 MPH til it straightens out. We have replaced the temp sensor, the thermostat, the fuel filter(extremely clogged) and the coil pack. Dealer ran diagnostics with check engine light off - no codes came up.
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Saturday, November 19th, 2011 AT 1:02 PM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Have the engine scanned again, most auto parts do this for free. Check your fuel pressure as you pum may be heating up and not working especially since you said the filter was extrememtly clogged. Then clean throttle plate with choke cleaner on both sides and iac hole. They gum up and cause idle problems. One last thing your pump may be failing due to the extrememly clogged filter, hard telling how much stuff has run through it.
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Saturday, November 19th, 2011 AT 2:48 PM

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