Hey guys, been using this site for a long time now and usually can find some related articles to solve any issues I'm having but today is the day I need help..
So I have a 94 GT with about 175xxx on it. Has BBK shortys, pypes high flow cat mid-pipe, flomasters, newer dizzy, coil, plugs, and wires. CAI with K&N filter, new egr valve, and a new MAF sensor. I have converted it from auto to a borg warner world class 5-speed and also replaced the computer when doing so. I also recently took all the smog pump related stuff out as well and replaced any vacuum lines that were involved with the FPR and EGR. I believe that is everything aftermarket I have done.
Now, I am having horrible timing issues and backfiring through the intake. I have checked the tps and it is putting out around ~1V at idle and a smooth curve with throttle increase. New EGR appears to be working correctly with the throttle as well. I just took the throttle body out and cleaned it along with the IAC and its ports.
I have adjusted timing to anywhere between 8-16 degrees advanced with the spout out doing the correct steps I have read everywhere. When the spout goes back in the timing is all screwy but seems to come back to the setting with throttle.
It runs fast as s*** for about 10 seconds after the first start in the morning or after letting it sit for 2+hours. After that its dead on its face. Also it will run even worse every couple minutes to where it will die unless I keep the RPM's above 1000 and has no power under load. If I'm moving at that point ill rev the hell out of it and clutch it.
I'm looking into getting an off road h-pipe since I took the smog crap out I just don't think that would be throwing it off this bad and it was doing all this before I did that. Any tips on where to go or check would be great. Im really looking at replacing the computer because I believe I got it off ebay when I did the trans swap. Hope this isn't too long of a post! Thanks fellas!