My buddy has a 01 ram 1500 318,4x4 auto. We did intake gaskets,plugs(autolights 3923's) cap and rotor all from auto zone only thing we didnt do was wires they are fairly new. I have all the same plugs cap and rotor in my dak and hasnt missed a beat so I dont think its any of that. After we did all this it seemed to have a little miss or it was just weird time to start. The missfire wasnt too bad but a month later its real bad now it surges under load in 5th and when its warm it has a random missfire sometimes its not noticable when cold. Sometimes its just a 1 cyl miss then sometimes its like 4 and it pops and backfires and has no power at all. Im thinking its the crank sensor he already tried the tps his old one was fine but got a new one anyway. Any of you guys have a idea not sure what to check next? Oh and looked at the crank sensor but couldnt get it out worst place ever!! any tips?

 

Codes?

 

+1, check for any codes. https://dodgeforum.com/forum/2nd-gen...code-list.html

 

The last two times I had a surge in overdrive (what you call 5th) it was from a melted/cracked spark plug wire.
Go over the spark plug wires with a fine tooth comb to check for a crack or melted spot, or if they're lifetime warranty wires then just replace them.

Smack the catalytic converter with a dead blow hammer too, if it rattles then it's bad.
Also, if he can't redline the engine then it's probably bad.

 

Absolutely no codes at all and yeah in over drive I was pretty tired last night when I wrote this so forgive me lol. The cat is fine just checked that last night.

 

The pre cat o2 will not always give a code if it's bad. I would unscrew it and leave it hanging and see how it runs. The cat can still be clogged even if it does not rattle. Either way, I would probably replace the o2.

edit, I would also check the fuel pressure, with a gauge.

 

Fuel pressure was at 45-50 and ill tell him to try the o2 sensor.

 

I also find it kind of strange that if it is misfiring as you say, that there are no codes for that atleast.

 

Its a random missfire it not always the same cyl and i've put my code reader on it and nothing ever showed up.

 

Did you route the wires according to the TSB....if not might want to check that out the correct way to wire it should be in the FAQ section