I need help!
When I'm sitting still at traffic lights, every 3-5 seconds the engine would make a shake and it is enough for me to notice it sitting in my seat. Not just the normal shaking of an Idiling engine as it's more rough. The car runs smooth when moving though.
I have just bought the car and it is a 1997 (MY98) Subaru WRX STi (Version 4) EJ20T which has just over 94,000Km's and is pretty much stock standard apart from a big bore exhaust from turbo, pod filter, & a twin trumpet BOV. The lady I bought the car off just over a week ago told me it is now is boosting 16.5PSI from those mod's so I'm not sure if a tune up would help. I was thinking about replacing the spark plugs with NGK Iridian's. It appears to have aftermarket spark plug leads on it because they are blue but I can't see a brand name on them...I'm guessing NGK leads.
Any help would be much appreciated.
Thanks
Cody