i have been having to replace the cps and crank sensor every year when it gets cold. this year i replaced both and now I have all cylinders miss firing. All but cylinder 5. It also shows that that i have several codes for the coils. i did just replace all of them last summer. Any ideas? i have a 2002 dodge ram slt with a 4.7L . Would it be the tps?

 

Do a compression check. 4.7 are a fickle creature. Is all the coil wiring good? Look for signs that critters been there.

 

Make sure you dont have moisture around the coils and the plugs.

It sounds like there is a bad connection someplace.

Did you recently fill up with fuel? If so, did this issue begin shortly afterwards? Its possible you have bad gas. Bad gas will cause all sorts of misfires.

It does not make sense that your crank and cam sensors go bad... that's very strange and not normal. those sensors should last a VERY long time.

Keep us posted as to what you have tried and what worked when you find out.

NICK
AIR RAM PERF

 

I took it to the dealership they told me i need a new pcm and fuse box. i replaced the PCM and cleaned the fuse box and there is no change. I was thinking maybe the timing is off. i looked up the code P1391 and it said the the cps or timing.