So when i'm driving normaly about 50mph my truck start to jerk once or sometimes when its really bad 5 sec of none stop jerking. It will also do it for a sec every now and again while stop at a light will in drive. The tachometer will sometimes fluctuate but not always. It will do this almost everytime i drive up hill too until i step on the gas then it guns and drive fine for a few minutes. I tried turning off OD but it changes nothing. There are no codes either.

Dodge Ram 1500 4x2 5.9L automatic

Ive replaced within the last 2 years
mustly due to failure or mantainece
crank sensor
cam sensor
battery
altenator
pcv valve
gas cap
spark plug wires
02 sensor
evap solienoid
cold air intake
air intake sensor
coolant temp sensor
water pump
pcm (I was told by a mechanic is was bad and it wasnt the problem)
power steering pump
IAC
TPS
rebuilt heads and replace plenum with an aluminum plenum
4 months ago had the transmission rebuild
spark plugs and distrubator cap 35000 Miles ago

 

Time for new plugs at any rate......

What brand O2 sensor?

Think I would try unplugging the upstream O2, and drive it like that for a bit, and see if anything changes.

 

I believe it's Mopar but I'm not 100% sure. It only does this when the truck is warm. The spark plugs are iridium and are supposed to last 50000 I pulled 3 out and they look geat. Thanks for the reply

 

Ooo. Rare Earth plugs.... Our engines generally don't care for those, I have seen rather mixed results from them. I would be tempted to swap 'em out, and see if that makes a difference. (just get some good copper plugs.)

 

My check engine light came on and I used the dash dignoses and got
34 3 55 I know there are all 2 didget numbers. I have a cheap scanner and is says fault 01 and pending 03
(Sorry using my phone if any mistakes)

 

34 is a cruise control issue....... Supposedly..... Need a scanner that will tell you what the P codes are.

 

All codes are double digit if using the key dance. Check it again and see what the second code is. 55 is normal(end).
http://dodgeram.info/Engine-Gas/OBDI/pcm_fault_code.htm

 

heres the codes i got with the code reader
p0301
p0300
p0306
p0307

 

have you fixed your plenum yet? 300 is random cylinder misfire, the others refer to miss on specific cylinders. This is a classic sign of blown plenum.

 

I rebuilt the heads 3 years ago and when i did that i replaced the steel plenum with a soild aluminum one that my uncle bought for me it cost roughly 100 dollars but i dont know the brand. I looked inside the air intake a few hours ago and it was perfectly clean with no oil inside.