Ive got a "91" 350 w/ tbi W/307k mi, when it starts getting cold it will start just fine,but after a min or so it will start surging. While driving it will miss very badly and will only run at wot. I also noticed lkg into tha tbi that gas seems to be more or less pouring into it,is this normal? It always come out of this and runs just fine.

 

All the usual suspects: Check distributor cap, rotor, plug wires and spark plugs. I would perform a compression test, leakdown test, and cylinder-balance test. Fuel pressure test, coolant temperature sensor, MAP sensor.

My usual advice: AFTER inspecting the ignition system and the fuel pressure test, connect a REAL scan tool to the ALDL connector under the dash, look at the data stream. The compression, leakdown, and cylinder-balance testing will be helpful in ruling things out.

 

1st of all,"All the usual suspects" are just fine.This is something thats been going on for a cpl years or more.Even before I bought it 4 mo ago. It is totally random when it acts up maybe once or twice a year,mostly under 50 deg temp.Then there is the fact that Ive driven it 7+ k miles since I got it,it gets about 20mpg,and uses no oil.Runs like a top.................until it starts getting cold. Im not familar w/TBI and wanted to know if there was anything to look for in particular.

 

Well,besides outside temp of 50 deg and lower causing the problem I FINALLY solved the problem. I noticed the exaust didnt seem to have alot of pressure and heard a slight exaust leak that came and went. Finally found the cat was leaking where the inlet pipes joined and they were solid. I cut the cat out and replaced it with a pipe. ALL problems solved. lol Cant really say that anyone on here was much help.