01 Grand Cherokee Laredo bucks
 

Yep, I'm a flipping newb so I hope I'm doing this right. If not, um...sorry?

Anyways, my issue. I have a 2001 Grand Cherokee Laredo 4.0l with 145,000 miles on my baby. When I'm cruising between 55-65mph it randomly bucks hard and the RPMs do jump when it corrects itself. It's driving me nuts. Now cruising at speeds lower or higher than the posted range it drives like a dream. It's completely stock and did a tune-up roughly 1500 miles ago hoping it would solve the problem. No dice. I have Champion Coppers for spark plugs and when I pulled them they're glazed. I've previously read it was a fuel pump problem; no, it's the Ignition Coil; it's the Crankshaft Sensor (replaced twice, issue remains); the Fuel Injectors; possibly the Fuel Filter, etc...

So I'm pulling my hair out here and I'm not going to randomly change parts left, right and center hoping for the best. Here's a list of trouble codes that have popped up once or twice but no more. I cleared the last code I got over 300 miles ago and still none have popped up since .

P0351, P0353, P0442 p/d, P0455 and P0456. So it's pretty all over the place in what comes up. And no, they all don't come up at once, only two at a time when they do.

Any help would be truly appreciated. Thanks.

Tristan