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Is your idle to high? It should be 700-800.
Loosen the kick down cable on the trans, it should stay in high gear a little longer.
did you get car from a used car dealer, I've seen some real stupid rigging to make cars appear sellable. Maybe it would not idle and they set it real rich
does it have stock air filter setup or a hot rod cool air intake?
What rpm does it shift into 4th gear?
If you got muscles, take power steering belt off.
vacuum leaks will fake out sensors, fill a spray bottle with water, spray vac hoses, listen for engine stumble.
Make sure clamps on intake hoses are tight to throttle body, and its not cracked and air filter hosing is clamped good...SC
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