Forbiddenspeed

i have a 383 fully built lt5 that i run up to 7000rpm on an auto. the motor only has 1000 miles on it and the tranny 100. it runs amazing until it warms up and as soon as it gets up to normal running heat it seem like the car is running lean i have no low end. ideas???????? i just replaced the opti to so its not that.

F0x Slaughter

You have an LT5? Or do you mean a 4?

LT5 is a DOHC.

If its running lean once it warms up, its closed loop problem. Could be the bad o2s.

Forbiddenspeed

sorry its a lt4. i wish i had an lt5. yea i think the guy who tuned it really didnt do it right

RamAir95TA

iTrader: (2)

Explain exactly what "LT4" components you're using, if any, and a detailed list of mods, so we can help you better.