Runs Like A Freight Train

[mad1517]

I have a 1992 GMC Sierra 5.7 TBI, in the summer or warm weather truck runs great.Winter or cooler temp runs like a freight train, very hard to shift.engine races when push clutch in at stop signs.I let it warm for few minutes but doesnt really help,seems to calm down within 5 miles or 15 min.I replaced the heat risor from manifold to TBi didnt really help.also tried cleaner on throttle body.any help would be great.Thanks Tom

[2000CAYukon]

Sounds like your Engine Coolant Temp sensor is bad or possiblely a vacuum leak that happens only in the colder weather.

Use a scan tool or volt/ohm meter to see if the temp sensor is working properly. ECT sensor is located in the intake manifold near the tstat.

//2000CAYukon

[mad1517]

Thanks for the help. Tom