1996 Chevy pickup 5.7 issues
My truck cranks and runs fine until about 50 + mph
and hold. Then it starts to feel like its missing and
sometimes pops aka back fires. I can make it
really act up by downshifting bringing rpm up to
where it throws a code p0301. I've changed
wires,plugs,cap,rotor,fuel injection assembly,fuel
pump,crankshaft sensor. The engine has less then
20,000 miles on it but sat off and on for about a
year. I've put every chemical in it thinking it may be
carbon build up but nothing. I've sprayed the whole
motor with starter fluid looking for vacuum leak
but idles smooth.