Strange problem

[Kevin.A]

Here's the problem i'm running into.
if i let my car warm up fully before stepping on the gas she runs like a champ.
but if i don't, even if i tap the gas while she's sitting in my driveway, she give me a hard time.
and then, even after she warms up(assuming i touched the gas) she bucks, and on higher rpm's backfires on both acceleration and deceleration. i have almost no power.

I have a stock ECU with a 1st gen superAFC that seems(according to my AFR gauge) to be set up to be just a tad on the rich side.

What could cause backfires on accel if i don't let the car warm up?

Thanks
Kevin A

[matafied]

what kind of plugs are you running? when was the last time that you changed them? just a good place to start

[Kevin.A]

NGK properly gapped, replaced in febuary. the problem only started happening after tuesday

[matafied]

well i just have had bad experiances with plugs in rb's, i would buy a cheap set of coppers just to trouble shoot.

[mott6904]

Ecu throwing any codes when it messing up? I would ohm out the coolant temp sensor when it is colded, warm and when it is messing up and see if that is the issue. The temp sensor for the ecu not the gauge.