i just installed 1.7 roller rockers and new lifters, after i put the car back together it was missing bad, so i took it back apart and readjusted the rockers and set the tinimg, it runs great when you first start it up cold, it will continue to run great and idle great until the temp reaches about 195, then the car runs very ruff and misses pretty bad, but if i let the car cool down the car will run great once again until it warms up. im thinking it is some type of sensor maybe ect