I have a 1992 GMC Sierra 350 Throttle body injection, 166,000 miles
When the Engine is cold it runs great! after warm up the truck has
a bad hesitation and chokes down when driving slow , like in a parking lot
or pulling away from a stop light, If you give it gas it picks up and goes on.
It runs great other than that
I have changed the plugs , took the throttle body apart cleaned and put back, changed fuel filter
Any suggestions to look at ??
Thanks