My truck has been having some problems i'm getting multiple miss fires and ive replaced almost everything to try and get ride of it and nothing still i am also having some problems when i use my revers it doesn't' back up smoothly like it should and it is ruff please help

 

Misfire could be related to plenum issues or not.

Should check to make sure plug wires are routed correctly, check the condition of the dizzy cap, maybe even pull some plugs to inspect.
http://dodgeram.info/tsb/1998/18-48-98/18-48-98.htm

https://dodgeforum.com/forum/2nd-gen...um-thread.html
Could explain some of the misfire issues. May not...

Do you know which cylinders are misfiring?

I'd work on the misfire issue first and than go to the transmission problem.

 

What all has been replaced?

 

spark plugs cap and roter and the cables for spark pugs

 

and the miss fires codes are p300 p302 p305

 

Basics first nothing else, comp test is a must, spark test next, then fuel psi. At this time only spend money for tools needed for the jobs listed until then no more parts or guessing as to what's to be replaced/fixed next. We can tell you to fix the plenum, replace the ckps but its not worth it until these basic tests are done.

 

Ok where can i get the stuff for the tests and what are they

 

Need a compression tester. Can rent or buy from most local auto parts store. Fuel pressure tester can be got from parts store too.

What year is your truck? - Nevermind.... 2001.

 

alright i will look in to them