That sounds for all the world like a failing O2 sensor.

The shop that reset timing evidently had a clue, as it sounds like they did it right. Of course, they weren't setting timing, they were setting fuel sync. (hopefully.)

 

Well I unhooked the o2 sensor like u said took it for a 12 mile drive and still have the symtops... could it be the crank sensor going bad. Causing this?

 

Yes, and don't cheap out if you decide to replace it.But so could any one of the other sensors be bad.(but I'm not wanting to spend your money on parts)I'd rather spend your money on diagnostic tools. Anyway, you want an analog meter(which are very cheap) to check the TPS. There is also this for surging, https://dodgeforum.com/forum/2nd-gen...ise-speed.html . And I'd also get a cheap fuel pressure tester and verify that also. There is also the possibility that even though you gutted the cat, some of the guts got into the pipe or muffler.

 

the cat was removed before the new muffler went into place.

 

Check your computer ground wire. They tend to break and shut off the power or resist the power the computer needs. It does not show up on any diagnostic because its not a sensor etc.

 

well today i went and drove the truck after trying a few things. as i was driving i noticed when cold the truck still does it but not a lot. after i drove it and it warmed up, when i was driving about 45mph it started to act up. and the check engine light started flashing." i had the oxygen sensor unplugged just to try see if that helped like mentioned, but i never have seen a check engine light flash like it did. and when it was flashing the truck could barely even get out of its way. sputtering and backfiring. i also noticed that if i drive the truck just right... under 45 mph overdrive off anything over 55 overdrive off i can only maintain speed with minimal acting up. but if i push the gas pedal more then like say 1/4 throttle it starts backfiring"seems like inside the engine" and sputtering/ bucking.

 

Clogged cat. Probably due to blown plenum. The CEL flashing is telling you the the engine is having some trouble igniting the cylinders..... which really isn't a surprise if the cat is clogged, and the exhaust gases have nowhere to do.

 

But in my description of the truck and previous post, the cat was removed before the new exhaust went in. and dont have a cat at all..

 

That seems strange....... Wonder if the exhaust is plugged up elsewhere?

Try pulling out the front O2 sensor completely, and see if that doesn't improve its attitude any.

 

It didn't do it before you changed plug wires, if I remember correctly. If it seems to miss at idle (I think you said it did at one time), maybe you could disconnect plug wires one at a time while its idling and listen to the motor. Maybe you got a bad plug wire or possibly didn't get one connected well. It sounds a lot like a miss to me, what you're describing. I've heard of folks getting a bad plug wire more than once.