It would not idle the other day, Exactly 2 day's. I had to turn the idle up just to drive it. IIt is better now but why would it do this? My mods are below

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86Z28, GM 350, Jet perf Q-jet & chip Dual snorkel air cleaner, Edelbrock performer intake, Edelbrock headers, Edelbrock cat-back, Off road pipe, MSD 6AL, Accel Super Coil, Moroso Blue max wires, Rapid fire plugs, Jet fan switch, World class t-5, Hurst Short Throw Shifter, Ram Flywheel, Center force dual friction clutch,Aluminum drive shaft, BW disc rear 3.45's & a posi, PBR calipers, Earls braided brake lines, Polygrapite bushings all the way around, poly tranny mount & torque arm mount, Hotchkis lower control arms & panhard rod, Rancho limiter straps, KYB struts & shocks, Gm Wonderbar, Edelbrock strut tower brace, SSM sub frame connectors, Jamex lowering springs, Carbon metallic brake pads, Crossed drilled rotors, Mobil 1 Tranny fluid & motor oil, GM syntheic rear end oil, K&N, Grant stering wheel, 1,200 watt system, Jet Black Paint, 91 Z28 rims, 92 wing, Tinted windows.

 

Could it have to do with my vavles?

 

Anyone.

 

check the fuel filter. Replace it if you haven't replaced it in a while. A fresh tune-up wouldn't hurt. Check the TPS voltage and proper voltage. Mine would want to stall for once and a while and then mysteriouly fix itself. was very annoying and unpredictable. But I believe it was because my fuel filter was clogged big time. But I gave my car a tune-up (plugs, wire, cap/rotor) at the same time son I didn't bother to trace it down. I also replaced my TPS the next day. I replaced my TPS because the voltage was outa wack and it wouldn't adjust right. I felt I had to give too much throttle for the acceleration I was getting. I followed the diag. proc. is the GM manual and determined it was BAD. All is good now.
James

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1985 Z-28 305 TPI
215,000 mi. Original Eng.

 

I did all that stuff that you said. before this happened.

 

Anyone else?