So after 19years, it's time to sell my 2004 XLT. 270k miles, put a new Ford crate motor and transmission and have taken care of my baby.
A while back out of the blue it went into what I call 'limp mode', no speed faster than 30 mph unless in neutral going down-hill. Throwing no codes and no pending codes. New MAF sensor, changer air filter, replaced fuel filter.

My gut tells me that it could be a plugged up cat??? But since the time it started having a problem, I have had a medical problem that makes my days of crawling and climbing around under the truck over

I know someone's out there reading this and said 'Oh his such-and-such is bad.

'What is this worth in it's current condition?

Cheers to all

 

If you have a vacuum gauge you can hook it up to the engine to check for blocked IN air or blocked OUT air(exhaust), easy tests
Hook up vacuum gauge to intake port
Start engine
should see 18-21" of vacuum
raise and hold RPMs at 2,500 or so doesn't need to be exact but does need to be high and steady
Watch the gauge
If its slowly going down you DO have clogged exhaust, Cat or muffler
If its slowly going up then clogged intake, air filter, cold air intake tube(mouse house)

Since there are no codes one of these is most likely, although clogged exhaust can set Lean codes over time

If you don't have access to a vacuum gauge, get a friend to REV the engine while you have your hand by the tail pipe to feel the flow
Should be instant flow change as RPMs change, test at higher RPMs if you feel the flow steady out but RPMs are going up.................clogged exhaust