Not a Mustang, but we got some brains in here and mine are about fried. GM 350 TBI. Coasting to a toll booth, clutch in, engine stalls so I dump the clutch and jump start it. 3 minutes later I realize it starts to chug and wont rev higher than about 2500, coincidence I think not. I thought the converter was plugged/blown out because it had done that same thing before. Last night I took out they-pipe to find NOTHING inside the cat. Took off the muffler to see if the insides were blown into that and it was clean. I'm going to try and snake out the tailpipe, but at 2.5" duals, if it got through the muffler it went out the tails. Checked ignition timing with ect off and its deadnutz at 0 (supposed to be, but I have a timing adjuster in the vehicle also). The only engine code I get is "ect short or disconnect at engine run" which is obviously from when I checked the timing. Anyone got any ideas what else could cause this? It only does it when it warms up; I adjusted rockers again that I installed a month or two ago, took off and it was fine for three blocks, then nothing after about 2000-2500...

 

i would set the base timing up to about 12

 

That shouldn't matter. It was set at zero for 11 YEARS and was fine. I can advance timing 15 degrees from the drivers seat. I tried and it made no difference. Thanks for the input though, timing was one of the things I was concerned about, but it only happens after it has been running a bit.

 

oh im sorry dude i new that wasn't the problem but i was telling youthat to help you get a little more perfomance.

it sounds like a fuel problem