I have a 98 a4 quattro 1.8t and I'm having issues when I try to accelerate. It acts like it doesn't want to go any where. I changed the mass air flow, coils, spark plugs but still having the problem! Any advice?

 

Have you checked for codes?

 

Yes and nothing. Before I changed everything out I was getting a misfire codes but now nothing and i still get the hesitation

 

Vacuum or air leak? Maybe N75 Valve (boost control). Turbo good?

 

Maybe N75 Valve (boost control). Turbo good?

 

Sorry it is still showing multiple misfire codes and misfires from the every cylinder. I thought that after I replaced all the coils, sparks and MAF that would go away and it didn't.... Any other possibilities? From research I thought it could be the EGR but not sure if its true.

 

Are the plugs gapped correctly? As in, did you verify them? Not all plugs are properly gapped out of the box, even if they say they are. What plugs are you using? Do you have a boost gauge? That can show you not only the boost you're making, but also if you have a vacuum leak.