Engine stumbling... especially under load

Hey everyone, I’m having some trouble figuring out what the problem is. My 4.7L V8 is stumbling on idle and under heavy load. Trying to alleviate the problem I’ve changed the fuel filter, new spark plugs, boots, and air filter and it still seems to do it, and I can’t find out what the problem is, and It’s throwing no codes. If anyone has had this issue before and found a solution please let me know!!

 

Clean mass air flow sensor, Check engine compression, cylinder leak down test and check fuel pressure. If no problem found, exhaust back pressure test for possible clogged catalytic converters.

what kind of mileage do you have on the truck?
When was your last oil change?

 

I got an Oil Change close to a month ago, and the truck has close to 230,000 miles.

 

Possibly look at a Throttle Body Cleaning and check your Ignition Coils for failure/cracks.

 

Okay, will do. Thank you!

 

Have you done your timing belt?

 

My timing belt is on order right now, should be getting it done in the next week or so.