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.
Check the iac. idle air control. it is either this or the tps. both cost about forty bucks each.
Everyone has an opinion and mine is the tps throttle positioning sensor. if it runs ok in park but then runs like **** when in drive? tps sensor
Same thing happened twice to my 1996 5.7L. changed the EGR valve, all was good after that. The valve gets clogged, sometimes you can clean it out a little to get you home. On the 96 it is located on the top of the motor on the front.
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I have roughly the same problem on my 95 silverado only I have replaced most of the sensors, rebuilt the throttlebody and have no vacum leaks, and in park, the rpm's pulsate from 500 to 900. once i get going, it runs perfect. to this day it is still acting up. I'm starting tothink I might have a faulty ecm. any suggestions before I spend alot of cash.
sometimes while driving at or above 55mph my truck surges as if running out of gas and starts backfiring
truck will run and I will drive it around then out of the blue the truck will just stop running , sometimes its hard to restart like its not getting any fuel
Runs great let set for half hour try to put in drive it will die
The engine runs fine when initially started. but when it warms up it begins to miss fire and looses power and eventually will stop. when this starts the RPMs will drop to around 1200 -1800 and will rar
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