98 F-150 4.6, missing bad!
I have a 98 F-150 Later model with a 4.6 in it. I had the motor swapped 10,000km's ago and it ran good at first. But over the past month has ran like a bag of you know what.
Took it to the mechanic, first there was a cracked spark plug, so put new plugs on, then their was a vac line off, put back on. Checked it out mechanic tells me there is a "moisture problem" that they think is the issue as to why it still misses.
When driving it misses bad when cold, then goes to an intermittent miss once truck is warmed up. But when towing my trailer with quad on it, roughly 1000lbs, it misses like crazy and has next to no power at all.
Any ideas where to start/look would be greatly appreciated. My thoughts are it's either intake related or bad coils.
Thoughts opinions appreciated.
Thanks for your time,