i recently put long tube headers on my blazer also added pulstar spark plugs. some emissions lines were cut and taped, i also moved the o2 sensor from the driver side bank only to the y pipe so that it would read from both banks... the truck is stuttering now and i am unsure where to start since so much has been altered. has anyone had problems with pulstar plugs? im about to try and put old plugs in and see if that fixes it, also the truck service engine soon light has come on and off since i have owned the vehicle... it ran fine until this project

 

that would be a great start is to figure out what that code is for. if its a o2 sensor code then that would be a good start there. you dont need a scanner for obd1 codes you just have to jump a few terminals, just google obd1 code retrieval im sure something will come up