My 1992 Rs 305 Tbi Has A Problem I Just Changed The Plugs , The Old Ones Are Black With Carbon No Idea Why Everything Seems Good, Timing Is Good ,no Codes,smooth Idle. Can It Be An Air Restriction
Thank You
Mr Stumped

 

a slight amout of carbon is normal with a car that hasnt been tuned.the factory tune seems to make them run rich.how many miles were on your old plugs and how much carbon are we talking about?

 

strip the EGR and CAT out