what exactly does putting the fuel pump in high mode do?? i mean sounds like more fuel output??? and yes i do want to get a down pipe to take the ubend and cat out. but wanted to try to fix this issue before and performance mods you know what i mean.Originally Posted by bluegtp91
Bad spark plug...was it damaged? If so then you have internal issues...if not then don't worry about it. Not sure if the CPS throws a code...never had any issues with mine. Cat...what cat?I'd get rid of it so you don't have to worry about it. Also...since yours is a '99...you might fuel pump issues...try bending the sensor tab seen here in this pic...
