Trying to determine how to approach this situation:
1986 Mustang GT - car will start and idle but will not move -- I rev up to 3500 RPM and the car begins to crawl away (this applies to all gears in T5 Standard Transmission)
Recent History:
I recently pulled the car out from storage where it sat for about 1 year. Just prior to storage I installed 65mm Throttle Body. Shortly after pulling from storage the car would die on idle, buck when accelerating, and a noticeable hesitation when accelerating. I was having to reset the TPS sensor over and again as it would not stay at consistent voltage (I would set .88v -.96v and it would end up back over 1.0v). I have been certain for awhile it needed a new IAC as well.
-Shortly after removal from storage the car had voltage issue --- (3 years ago installed SVE 130 AMP 3G alternator - failed about 2 years ago and was replaced) and the voltage regulator was replaced 2 months ago for failing by fluctuating voltage - getting to low (13 volts) and not staying at 14.5v
I have replaced PCM relay and Fuel Pump Relay.
I have tested fuel pressure which was at 30-33 PSI with fuel regulator and 40 PSI + with regulator capped.
I have tested for consistent spark
Tune up done just prior to storage - (Plugs, Wires, Screamin Demon Coil, Cap/rotor)
I have run the codes and I receive the secondary Air Injection System Inoperative codes (94/44) but I expected to
Side Note: Heard Rattling at Crank Pulley - investigated and found 2 out of 4 hex bolts were a little loose (aluminum under drive crank puley)
Prior History:
Smog Pumped Removed - Still have EGR - Plugged behind Cylinder heads
Long Tubes, off-road h-pipe
CAI
bigger battery relocated to hatch
upgraded started
dual electric fan SVE Aluminum Radiator
Aluminum Under Drive Pulleys (Crank and Water Pump)
upgraded 255 lph Walbro Fuel Pump
130 amp SVE 3G Alternator upgrade
NO major engine mods
IDEAS:
After replacing voltage regulator I still planned on replacing IAC. I have been trying to determine if this vacuum related or electronic and the fuel injectors are not firing or something or is it the inside the engine...
I am thinking of replacing TPS, IAC and maybe ECT (which is less than 2 years old) and ACT and maybe O2 - I am confused because this is a major power loss - the car will not move until WOT and then barely accelerates.
Also, thinking about EGR delete vs replace EGR position sensor and EGR Valve
I have not yet found noticeable vacuum leaks but it is all 30 years old
Any advice and input on this would be greatly appreciated. Im not sure the right direction to move forward
thank you
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