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1990 ford f150 custom v8 5.0 302 rough idle stalling jerky

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1990 ford f150 custom v8 5.0 302 rough idle stalling jerky

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Default 1990 ford f150 custom v8 5.0 302 rough idle stalling jerky

Hi my truck has been having recent problems of rough idle, jerky, sluggish, back taillights not working, volt gauge going back and forth, dying. Its weird if you apply the brake pedal. It will cause issues of volt gauge jumping, rough idle and the indicator will slow down/ stop to. I have changed the following things , pcv valve, brake booster, check valve to it, the egr, the map sensor, idle air control, throttle position, battery, alternator, checked the battery cables. It feels like a vacuum leak or electrical . When I took off the brake booster vacuum line and the pcv it ran normal. So changed those out. Still doing it. Any help would be much appreciated ! .
Cheers
If you need anymore info let me know.
Its weird if you put everything on wipers, lights and heating the battery/volt gauge drops right down but comes back up when you turn it all off. The lights dim now and then, taillights don't work now and then. A lot of these signs were leading me to alternator so I changed it out. Still on the hunt to find the issue. Could it be possibly
Fuel pump, Computer, electrical ,vacuum leak, starter relay .
Any help would be much appreciated.
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