I have an 88 5.0 tbi that starts right up but runs for just a second or two. Once it starts I can keep pumping the gas pedal constantly and it will stay running but kind of rough. After running it about five minutes by pumping the pedal I noticed a smell like medal getting very hot. I shut it off and look under the car and noticed the converter and exhaust pipes seemed very very hot. Could my problem be a clogged converter? I did change the fuel filter and it seemed to have pressure. The car has 55,000 miles on it.