I have replaced the icm,tps,crank sensor( hope is in right watched a lot of videos) also replaced cam sensor and wiring harness that goes to all of those. Tach does not work. Car will run at a higher rpm but will not idle. Please help anyone.

Try unplugging the MAF and see if the behavior changes.

Are there any other symptoms, trouble codes, sounds, etc?

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WHITE WHINE - 1992 SSE Supercharged 236.26 ci (.040 Over) 15.090 at 90.2 MPH on old engine w/ slipping trans & melted O2 sensor - Gen 3 M62 and matching TB, Gen 2 Pully, Zillamotorsports Ported LIM, YT 1.72 Roller Rockers, SII FPR & Injectors, Hypertech Thermomaster chip w/ 160 Thermo, TransGo Shift Kit, Infinity/Pioneer Speakers & a 10" Alpine Type R Sub, all the watts, 140 amp Alternator, Ricepipe CAI w/ heatshield, Pilot Angel Eye Foglights, Clear Corners, '02 17" Chrome Bent 5's, Magnaflow F-Body Muffler and Hi-flo Cat, Ceramic Coated Ported Exhaust Manifolds, Fan Override, Monroe Reflex struts, red calipers
2009 G8 GT - Sport Red Metallic, loaded, SOLO Axlebacks, Rotofab Intake, Tuned, autodim mirror, removed intake manifold cover, HSV GTS triple gauge pod, two tone red-hot shifter and HSV SuperSport steering wheel, GXP rear sway bar and diffuser, 3.45 diff and various Camaro suspension bits, LED Taillights

A few other things that could cause poor idle are EGR stuck open and vacuum leaks.

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Boost addict


The Fleet:
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'97 Camaro - Top swap
'05 STS - V8, AWD, her DD
'92 Trofeo - Fair weather DD
'99 Montana - top swap 3800
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YES, UNPLUG THE MAF SENSOR AND SEE IF IT IMPROVES. then you can check the IAC IDLE AIR CONTROL. if that fails, it would cause your issue.

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poverty forces one to do unorthodox things

2000 SSEi
past rides:
1996 SSEi
1992 GTP
1987 Grand Am

I had this same issue on my '90 bonnie and it was the iac.