87 XT warm-up stumble

[RMVR53]

Yeah...I'm still working on it but I'm really loosing my motivation....

 

87 XT non-turbo

 

new- coil, cap, rotor, CAS, different distributor altogether, different TPS, different MAF, different temp sensor (what else...)

 

When cold it starts, it runs fine...wonderful in fact. After warm-up, different story. It still starts fine, idles fine, but under accceleration it just falls on its face. almost like someone turned the key off dies. Watching the tach, if you try and hold you foot in the throttle at anything above 2000 RPM the tach will drop to zero. Take your foot out of it and it springs back up to an idle point and continues running (it does this with the tach lead at the dist. plugged in or not so we're 99.9% sure its not got anything to do with the tach). Also if you attempt to hold your foot in it for say 4 or 5 seconds it starts backfiring (out the tail pipe) and develops a nasty miss (it is also doing its drop to zero/bounce up/drop to zero/etc during this). Take you foot out altogether and it goes back to a nice smooth idle.

 

The original job was a head gasket/valve job so yes connectors were removed/etc as needed to do this. The car was sitting with the windows up and no way for mice/etc or moisture to get to the harness under the right seat. All grounds under the hood have been cleaned at least twice..and I dont think I have missed any although with the flustration level at the current point, I may have missed something simple...but I doubt it. All connectors have been removed, sprayed with contact cleaner and re-connected.

 

Any ideas ya'll before I shoot the thing to put it out of my misery?

 

Bill F

 

as a ps...

 

I have extra TPS' out of an 88XT, 88GL turbo and 88GL10 as well as a MAF out of an XT88 if someone needs stuff...