Ok guys iv got a 1994 ford f150 Flairside 5.0 v8 iv replaced the
Egr, tps, maf o2, starter battery the computer but I'm having problems still with my Acceleration. The computer is only getting 2.9 volts but needs 5 so it won't read when I come to a stop light the battery Gage goes down then has slow speed but it also sounds like the idle speed goes down I think it could be a wire but I don't have a clue some good info would really help thanks

 

Bad alternator? Also check all grounds especially for the cab.

 

Well when ever I take one of the grounds off the voltage goes up one thing I forgot to mention is that it will back fire or miss fire I can't tell but I don't think it's the alt but seeing is how the comp will not read it's hard to figure what the problem is

 

Check the fire wall harness connections for corroded pins.

 

Ok well dumb question what's the firewall harness look like is it the part right next to the comp and I don't thing it's a valve leak either and everything else that's electric works right

 

It might work but without the proper voltages they wont work right and kill the engine. The harness plugs are around the steering column, its either round or rectangle, and reading again if your batt gauge goes down, could also be the voltage regulator going bad,

 

Thaks I'll have to look at it today when I get off work

 

Well it's no the voltage meter and I bought the ford repair manual I'm going to check that other part today