Thread: Misfire issue/question

I am having an issue with misfires on a 1999 GP GTP.

The parameters in which it happens (intermittent):

-approx. 40-50 mph
-cruising

When it occurs:

-when you gun it

Basically if you are crusing at about 40-50mph, and then you gun it, it will misfire continuously for about 6-7 seconds if it is held down, but if you let go, give it a sec, and step back on it, it seems alright, but kind of laggy.

I first thought the tranny wasn't downshifting, but now that it has occured more, I notice it definitely is misfires.


I changed spark plugs just recently (within past month n half), so it should not be them. It isn't a highly modded car (yet) so I don't think it is a mod I have done either!


Any suggestions will help!


Thanks

When you did your plugs did you change the wires? If not that's most likely going to solve the problem.

Nope, I have not changed the wires, I was going to do that today, but idiots wrote my paycheck for two days after today, so I need to wait another two days.

Originally Posted by cliffdawg

check vacuum lines same thing to me. check for cracks

Will do that as well. Just the ones on the top of the engine with the T things in it (MAF, S/C thing, and one other connection)? This car has already had those crack once before (not when I owned it though).