I have a 1999 Grand Prix GTP that is stock other than AL 104's and a 2.5" catt'd downpipe. I am considering getting an Overkill tune, but is this the right step? I want to get a tune and then work on saving up for a MPS with 3.5" pulley, or maybe even 3.4". My car has about 192,000 miles on it. I did a tune up on it a few months ago and put the normal plugs back in it because some of the plugs I pulled out of the car were destroyed. After a month ish with the new plugs some of them were destroyed so I replaced them all with AL 104's because they were cheap and the car was running lean so I thought maybe that would help. Then I found out I had a bad boost bypass solenoid and replaced that so I don't really have the issue of running lean anymore. But I still get plugs that randomly become destroyed and I'm not sure why. For example, after I fixed the boost bypass solenoid I had a cylinder 3 misfire, and replaced the plug. After that I randomly got a cylinder 4 misfire, and replaced the plug. Recently I had a cold that read something like cylinder 5 is starting to try to misfire. I'm not sure why random plugs are being destroyed. I have a few pictures on my photobucket of the pictures. The most recent picture was the plug from cylinder 4 when it was misfiring. But it wasn't misfiring bad enough that the car was acting up or the CEL was flashing, it just would misfire enough that it popped a code saying "cylinder 4 is under misfire conditions" basically.
http://s1334.photobucket.com/user/th...?sort=3&page=1
So I'm wondering. Does anyone think a tune would help my car with this issue in any way? Because to be honest, I'm not sure why it keeps eating spark plugs. Colder plugs or regular temperature plugs the thing just destroys them all. Thanks in advance for any help =)