I have a ford f-150 w/302 engine and it started to have a miss and i changed the plugs cables rotor and cap .?

while driving the truck the oil gauge is in normal zone but when i sit for s while the gauge starts to jump to the low side and goes back and forth. when i put it neutral it levels out. and also when im driving it starts to vibrate at any speed if i let off the gass pedal it stops or if i give it more gas it stops. i even changed the oxygen sensor as well . and also if i remove the oil fill cap the engine idles diffrently not much but you deffinetly can here it what could my problem be and how may i fix it.I have a ford f-150 w/302 engine and it started to have a miss and i changed the plugs cables rotor and cap .?
Try the fuel filter next.I have a ford f-150 w/302 engine and it started to have a miss and i changed the plugs cables rotor and cap .?
Faulty oil pressure sending unit causes the gauge to fluctuate. Not a big deal. Removing the fill cap causes a slight vacuum to develop in the crankcase and slightly restrict the amount of air entering the engine at idle. Perfectly normal. As for the vibration, I don't know.I have a ford f-150 w/302 engine and it started to have a miss and i changed the plugs cables rotor and cap .?
i own a repair shop,and it sounds like you may have a vacuum leak on it somewhere,,you need to check it,and make sure you didn't knock anything off of it while you was working on it,,its real easy to do,,and you might not have noticed anything being off of it,,just check it over real good,,you,ll find It,,good luck,i hope this help,s,