im running really, really rich....afterurn and all that...use 93-94 octane fuel (whichever the highest is at the place i stop at) and for awhile that stopped the backfiring...anyways, i recently replaced the fuel filter and it seems to have helped somewhat, but im wondering what else i need to do to get at the heart of this problem....i know gettin a fuel pressure regulator and a a/f gauge will help, but any other suggestions?

i dont have a problem with the mileage im gettin now, so if there is a way to up the air that is gettin inducted, that would be cool also...

if that last part is retarded, let me klnow...im still learning...heh

 

What's the car TII or N/A?

 

90 gtu (n/a)

they are supposed to run a little rich, right? i just dont think its supposed to be like this

 

Do you have a ton of mods? Because there is no need to run 93-94 octane. Save yourself the money. Do you have free flowing exhaust? That would explain the backfires along with the need to change to lower octane fuel. BTW welcome to the board!

 

When was the last FULL 60K mile service/tuneup?