Have 2002 Audi Allroad Quattro Wagon 2.7
Driving down road and felt like I ran over someone. Got a thump for about 1 second. Took to shop they said I had 3 injection coiles that were bad, replaced all 6 plugs and injections coils. Drove 5 miles had same issue. Doesn't matter if I'm going 45 or 70. Within last year replaced torque converter, left front air bag and the compressor for the air bag. Last week replaced defective left front air bag. What could be causing this thumping noise? Driving me crazy.

 

I know very little about cars so my original post may have you wondering, what is he trying to say. Surprised no one answered.