Thread: Spark plug suggestions?

Originally Posted by projectGTP

i have a 97 gtp and i have the 3.4 pulley, 180 thermo, colder plugs(im guessing), resonator delete, and soon to have the u bend and high flow cat. i just blew out my trans and am currently rebuilding it. since i pulled the motor i started to disassemble everthing to paint it. everything was clean but there was alot of sludge build up. anyways, the car ran like **** when i had it out in the summer. when i removed the plugs they were very dark and my dad said it was running too rich. the plugs were bosch platinum i believe. is there any plugs that anybody recommends i should run?

Your best bet is probably 104's (regular copper). Our cars don't like platinum very much. The copper's will have to be replaced often but, $1 a plug im not complaining