Yes, started with the TB cleaningI didnt notice any problems until I cleaned the Throttle body. I checked codes this morning and found that the EEC light stays steady when doing the self check. It nevers gives the blink,blink,blink ok sign. Maybe coincidence but the running rich didnt start...

Paul, thanks for the help so far....I have another question for you. I tried pulling the fault codes and it shows that the EEC is bad (my check engine light is missing so I used a continuity light to pull the codes). Im going to pull the plug on the EEC and make sure when I put it back...

Is this the problem?I got to thinking about this and is the TPS making the engine run rich or could there be something else that I screwed up?? I checked all the vaccum hoses and they are fine and also installed a new EGR valve a couple of months ago...thanks for the help.. ron

Last week I took the throttle body off of my 89' E350 (5.7/351) to do the once a year cleaning with TB cleaner. I think I screwed up the TPS (ok I know I screwed it up). The engine is now running extremely rich and is blowing out black smoke on idle, runs good other than at idle. Also has a...