I just recently bought a 90 after selling my 71 blazer, guess I could not live with out one. Any ways, my question for you quys is that my blazer is running way rich as if the choke is on. It has the throttle body. I checked my codes and got the TPS code. I have replaced it and there are no more codes. Put fresh plugs in, got it to fire up, and the sme thing is going on. Black soot and fouled my plugs. What is wrong with my blazer? I need help before I go and do something stupid. thanks.