Topic: erratic engine idle 93 5.0

[93LXCONV]

took the car out for a drive this morning...ran great got some gas drove for about an hour...came home car sat for about 10 mins went back out and the car miss fired and started to buck idle went from 100 to about 2000..got the car home barely..very little power..did smell a hint of burnt rubber down bellow the starter..did not find a bad wires..later started the car idle fine for about 2 mins..and started the erratic idle again...any ideals?

[Soaring]

Most likely it's fuel related.  Check your fuel filter, then your fuel pump. 

[zebo87]

I agree it sounds like fuel probs. Also check the maf.

[93LXCONV]

replaced fuel filter old one was only a month old..check fuel pressure have 35lbs ..unhooked the vacuum to the regulator had 42 lbs......maybe bad gas ...might try to remove the 12 gals just to see..sounds.... like the car has one nasty camshaft..cannot drive has no power...

[zebo87]

Clean the maf and check for vacuum leaks

[Soaring]

If it started doing this shortly after filling up the tank, I would suspect a load of gas with water in it. 

[93LXCONV]

odd thing hear.. just for kicks I checked the fuel pressure again( next day) and had nothing.....I can hear the pump start when key is on..removed line into fuel filter turned on key again a small amount of fuel shot out and that was it...so I am going to remove the pump have not done one in this year Mustang..any tips? would be helpful..thanks Phil

[Soaring]

If the fuel pump is working, which it sounds like it is, then you have something plugged between the tank and pump. 

[93LXCONV]

this has turned into a nightmare from hell..changed fuel pump ...before that removed battery cables and even tripped the interia switch..no longer have power to the fuel pump..ran a jumper to the fuel pump and pump came on..all electrical plugs are clean ..relays are both working..have been checking all fuseable links..cannot find a break...now ran a code reader..have code 95 ..for kicks changed out 2 interia switches..nothing.... did a voltage check to the pump getting about 7.5 volts? is this right? this is a great running car never had any problems until now...

[Soaring]

I think code 95 is a secondary fuel pump circuit pcm to ground.  Try to find the power control module that comes out of the computer and trace those wires to the PCM.  If all is well, then the PCM might need replacing.  Whenever it gets this complicated, I take my 03 Mach to a mechanic.