Recenlty changed my plugs to NGK PFR7's and adjusted gap to 0.7mm.

Car ran very very well, but recently, on long motorway journey I started having problems (stuttering, hesitating, misfiring and back firing).

If the car is left to cool the problem repairs itself, then comes back after 10 -15 minutes driving.

I have been told it could be MAF and I have a new one on the way. Just wondering whether spark plugs could be cause.

I have brand new coils by the way.

MY94 WRX

 

No mate, if you've just changed from 6's to 7's then your sparkies may be too cold, allowing carbon to build up and causing mis-fire. Check -em and see if they are black and oily looking

 

cheers mate

 

RooJai,

Nice for you to have a good friend like that to help you out, Same name too

Dean

 

wtf?? LMAO

 

PMSL! Had to read that twice because I thought I'd missed a post somewhere!

 

Roojai, that must come in handy.