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run great when cold after it warms up no throttle response when kicked down won’t rev over 2000rpm if you lift your foot up engine will speed up some what but still no power.new tbi .sensor. new catalytic conv.good fuel pressure good.new map sensor.even changed iac control and cleaned.checked all vac-um lines and or repaired them.changed temp sending unit.I’m missing something stupid
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check ignition timing with a timing light. also check the distributor rotor and
shaft for play.http://www.ericthecarguy.com/faq/solving-automotive-performance-issues
You may want to put a fuel gauge on it while driving. Tape it
to the windshield. The truck runs better cold because when cold
the engine runs richer which makes me think fuel related. It could
also be the fuel pressure regulator.5.7 engine?Did all that fuel press 6 to18 psi timing on tdc new map sensor tbi new cat and exhaust new temp sersor tried setting timing old school( vacume gauge 20hg )still wouldn’t pull a sick buzzered off a shit wagon ass soon as it warms up
Perhaps it’s not an engine performance problem but a transmission problem you’re dealing with. Does it rev in neutral? If so, you might want to look to the transmission for a possible issue. More info on that here.
http://www.ericthecarguy.com/faq/solving-transmission-problems
Also, do you have any check engine light codes? If so those might be an important clue as to what’s going on.
Good luck and keep us posted.
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