I recently swapped my 100K+ L03 for a mildly built-up 350. The day I picked the car up it ran fine. Ever since though I've been frustrated by a rough idle -- eventually stalling out.

Which is followed by a hard starting condition. (unless i put the car into "clear flood mode") which then only idles if I manually hold the car at part throttle, say 1500 RPM's or more.

I've replaced the fuel filter, and IAC,
I've taken the fuel pressure at idle: 11 PSI
I've rebuilt the throttle body, serviced injectors, and replaced the thermostat

I have the most recent datalog available here.
http://www.claresco.com/clients/ALDL_Data/AldlData.txt

I only chose these fields to post, however I have the entire log if anyone needs a more complete picture.

Right around the 162 second mark, (less than 3 minutes after start) she dies. I see the IAC is closed ? But I could really use some help pointing me in the right direction.

Any and all help is appreciated !
Thanks.
1991 Firebird
350 sbc
218/224 @ .50
Edelbrock Performer Intake Manifold, heads, and headers
Single 3" Cat, Flowmaster

 

well, no one bothered to reply. . . guess my post wasn't worthy.

In any case i've found some help in the TBI forum, and moved the post here

Feel free to delete this thread.

 

I for one never saw it. Where are your BLMs and your INTs? Those are very important in the grand scheme. What about knock counts? You'll be needing that too.

 

jeepguy553,
hi, like i said i've moved the post here . . .but the full datalog is available . . .here

On the advice of the chip company, I tried adjusting the throttle stop with the IAC fully extended and unplugged. I raised the throttle stop until the engine quit sounding like it was on the verge of dying -- according to the log that shows a TPS value of around 5% (.74 volts ?), as opposed to the stock value of ~.5 volts.

I understand this is configurable in WinALDL, and have no idea what my setting is, so i left it at default .54 at 0%. I've posted these datalogs .here