well the car has now developed a pattern when it pulses.

Ill go out in the morning and start the car up and it will idle til it warms up and throw either 300 or 507 code which is multiple misfire and/or idle speed higher than expeced (idles like a v8 with a huge cam all of a sudden and idles at 700 rpm's)

I can cruise after its warmed up and when i park somewhere lets say a store, come back 10 minutes later and start it it will be pulsing til the next time i let it sit til its 100% cold. now what the hell is causing this guys? TPS? im stumped again.

What do the spark plugs look like?

havent checked them out, are you thinking im leaning out even on daily driving? if so wouldnt the plugs be clean as a whistle?

mine has been idling funny lately

my iac shows 0 on auto tap , but didnt show any movement , and i know the iac is workin , but i do know it sits near 0 even when it idled fine , i think ive got a vac leak on the tb that has been there since i put the s/c on , the adaptor is striped on 2 bolts


almost forgot , im gonna replace my tps and iac and see if i get any changes






Edited 1 time(s). Last edited Sunday, July 02, 2006 11:59 PM

I was just wondering about the gap on the spark plugs and the kinda of spark plugs you have.

Are they the stock GM SC plugs? I've heard people have problems with those, and have switched to some NGK's .. (TR6?) i don't remember which model it was, it was something like one step colder then stock, or maybe two. Can someone who know's chime in.

Other then that, why do you think you would be leaning out?

yeah i have the gm s/c plugs in, i dont know why i would be leaning out but then again i have no idea on why i start my car up sometimes and it throws a 300 misfire code or a 507 idle speed higher than expected, one or the other. its a mystery honestly.