99 Expy 5.4 Cold running problem
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99 Expy 5.4 Cold running problem
My 99 expy has 122k on it and ran great until today. It has the 5.4, and it starts fine, but when the engine is cold, it stutters and stumbles at take off and when lightly revving it. At wide open throttle it runs great. when I get down the road for a mile or two, it runs perfect, at takeoff and normal acceleration. Also, no matter what the engine temp is, if I gas it in PARK, like a quick throttle blip, it stumbles. It only runs like crap when the engine is cold. Any suggestions of a common sensor or otherwise? The engine light came on and flashed on my wife today, then went off. I have not seen it at all. Any help would be appreciated.
