I have a 1994 s/c that idles at 1700 rpm after letting off the gas for about 7 seconds, then it drops down to 800 rpm. It also seems to have a dead spot under light acceleration and a slight surge. I have replaced the iac, plugs and wires, air filter, fuel filter, clean thottle body, checked vaccum leaks, and cleaned mas. Could it be a bad tps,or a bad egr?
Thanks,
Scott