Hello Guys, first time poster here, so cut me a little slack if i dont get everything right;-) Anyways, Just purchased a moderately upgraded 02 bugeye about 2 weeks ago, and have since then been going over everything in the engine just to make sure things were broken and that the mods were done correctly. Well last night it was time to change the spark plugs (74,000 guy i bought it from said he never changed them out and didnt know what kind were in there) so i got the spark plugs out (which were NGK iridium's) and they looked a little overheated (white) and the insulators were pretty much gone, so i went ahead and purchased some stock range NGK Platinum's and gaped them to .031, I then installed them, and put everything back together. After that i turned the car on thinking everything would be just dandy being i only changed the park plugs, but when i turned it on, it sounded like 3 of the cylinders weren't even firing, and the 4th one was barley aking it. So i pulled out my scanner and looked for codes..nothing. i then inspected my maf/vaf connection and it was secure, I couldn't think of anything else to check for so i decided to take two of the plugs out and gap them to .040 (that's what the old one's were gaped at) and then reinstall them and see what the engine thinks, so i did so and to my surprise the engine acted pretty well, this time sounding like 3 of the cylinders were firing and only one not, i then decided to take the OTHER two plugs out and also gap them to .040, so that all 4 plugs would be at the same gap. After doing so i turned the car back on, and the engine sounded like crap again! So i gave up and went to sleep. let me tell you what i'm working with.
3 inch Catless straight pipe W/Optimus muffler
Catless down pipe
Apx custom intake pipe and turbo pipe
Custom front mount intercooler
Turbo XS BOV
Greddy Turbo Timer
Greddy A/f monitor
Hope you guys can be of some help. Thanx in advance.