ECC was reading 92 F today in the wind, car was running fairly hot with the 195 inplace from the winter, and my Jet Stage 2 chip says run a 180 no matter what. So I bought a new TStat, drilled it, and installed it, ready to go instead of running at 200-210 it sits at 185 all the time now I stopped after work to buy some food, got back in the car, started it, it chugged a few times, back fired, then stalled..did that a few other times, then idled SO rough it surged when moving..no SES..then it went off..im thinking..heat related..? And im running gas from a station ive never used before..

call me dumb but maybe its vapor lock since you did work on the t-stat.... take off the radiator cap once it cools... cant hurt right??? good luck

Sounds like it could be bad gas also

this was previous to changing the Tstat.
It seems FAR more gutless now..maybe due to the fact that its 90 outside, gunna be 95 today, and my AC was on full...
we shall see

AC will rob a good bit of power unless you are WOT and I think that other heat related power robber you are experiencing is KR.

yeah with my 2.2 im sitll pulling KR even in 30 degree weather....
WOT just isnt as good as it was before..LOL

Maybe it'* time to swap up and get rid of some KR.

EFI cars don't vapor lock.

Sounds like bad gas.