1991 V8 Quattro no start!!!!!

[DasV8Quattro]

Hello, everyone, just bought a 1991 V8 quattro with 88,000 miles. Car ran excellent with power to spare when I bought it. However, after degreasing engine, driving around town, and putting some premium into her, she fails to start. I started her, backed out of the garage, and shut the car off. Came back to her an hour later to find a no start condition. Timing belt is good (checked), took out fuel pump and tested (good), relay works. I also took out a spark plug and it had an extremely hot flame kernal as all wires, cap and rotors, and plugs were replaced. So I know it is not the dreaded crank positioning sensor or the rpm sensor. The car ran so good to not starting, that it is annoying me to not find out a problem. Even if an injector or a few went out, the car would still try to start, right? I also checked all of the fuses which are fine. Could a component in the fuel delivery system been vulnerable to the degreaser? The car ran fine for an hour after I degreased it. I would really appreciate any knowledge about above said problem! I have owned 3 other 1990 to 1991 audi's and never had a single problem with any of them except the cv axles!

Thanks a lot!

[schroederaudi]

yea i have a 1990 audi v8 and it does the same thing with the premium gas. so i put the mid grade in it and it no longer does not start when it is hot. but does your car some times stall when it is in park thats what mine does now and i cant figure it out.