NF need help with 97 f150 4.6 (might be timing)

[skinny]

ok I have a 97 f150 that was running ok. I parked it at a creek to fih when I was ready to leave it backfired.

ever since it runs like its out of time popping and snaping.

i had my neighbor over with his scan tool it gave no real codes to help

I have swapped out coil packs and also the mass air sensor with no change

looking for pointers or ideas

 

I would check the timing chain but it looks lke alot of work anyone have a simple way to check it

 

could really use some ideas need to drive to work in morn

[ecmilley]

without being there myself to look it over it's hard to say, try putting a vacuum guage on it a jumped chain will give you a low steady reading.

when is it popping? idle acceleration cruising

my expierence with the fords is when no codes are showing up and performance issues arise good chance you plugged up a catalytic convertor