Thread: multiple misfires

hi guys,i have a couple issues with my 2000 gtp,i have the following mods-3.4 pulley,dhp pcm,thrasher cai,borla exhaust,hiflocat,tog headers,msd coils,taylor wires........now my gtp only has 35000 miles and has never given me any issues till now..........while driving the other day the car started to misfire pretty bad that it threw a multi misfire code........the first thing i did was change plugs,ac 41-101 are the replacement for the 41-921.....still had the misfires......so i put back stock coils.......car started to pull much better at take off,but still misfiring under heavy load,,although not as bad as with the msd coils.....soooo im thinkin the coils were the fix,but by changing the plugs maybe i did somethimg wrong? wrong plugs?bad gap? wires? keep in mind though the car only has 35000 miles........so im lost about these misfires..second issue is the sc........started makin rattling noise.so i changed coupler,noise still there.so im thinking its the needle bearings...i see rebuild kits all over the net,how hard is it to rebuild using one of these kits? thanks in advance guys....ron

hmmm....before i changed the coils,i did change the plugs.....i put ac 41-101.....im thinking maybe the plugs were gapped wrong,as i didnt check,i assumed they were pre gapped....or maybe i messed up putting them in? i swapped back to the msd coils just to compare and it misfired more off the line than with the new stock ones i got.....i got some ngk pluggs today i guess i will give those a try.......

TR55's come gapped at .059 unless they were hit in shipping.

needle bearings involve tapping the hole behind the bearings and then putting a grease fitting in there and pressing them out with grease.

Then you press the new bearings in.

If you find someone who can do it.... which will be tough, it should only be $20. Thats all I paid.

+ the bearings obviously.

update guys.........i figured the original problem were the coils,but before i changed the coils i changed the plugs,i got the ac 41-101,i assumed they were pregapped and put out them in,misfires was still there,than i changed coils,car ran much better,but misfire was still there at wot,sooooo today i changed the plugs again to the ngk tr55"s and gapped to .059............misfires gone!!!!!!! yah!!! as far as the sc,i got one offf ebay for 225...going pick it up tonite,hopefully its in working condition...........thanks guys for all your advice!!!!!!!!