My 97 Chevy c1500 4.3 Lt runs perfect while sitting g on the driveway.When I drive it and go to 4th gear at around 2000rpms, the truck starts hesitating.the code shows multiple misfire.
I noticed it does it early in the mornings when it's cool but not during hot
weather.Ive replaced distributor parts,coil,cables,plugs,crankshaft sensor,cam
position sensor,mass sensor, intake position sensor.