2007 WK driving problem
I have a problem with how my WK drives. It's a 4.7 and when I get it to about 40 mph it acts like it can't go any faster and I try to accelerate and it won't go like it should. It also stutters like it wants to go but it can't. I replaced the spark plugs, egr and pcv valves and oil and it helped immensely with my gas mileage since It would take a quarter of a tank to go 60 miles. What could my problem be? I seafoamed it and a lot of smoke came out. I just have that one problem. It has about 82k miles on it and the previous owner didn't really do regular maintenance on it. Any help would be appreciated so I can figure this out.
I read on the forums that a software update or whatever it's called could solve this problem but what exactly would I tell them?