My thoughts :
1) Are there any codes set? You need an inexpensive ODBII scanner. I use a blue tooth one from Amazon ($20)
and the "Torque" app on my android. This is an absolute MUST tool for anyone with older engines.
a) Transmission flushed and filter change
. You may have a 2000 F53 chassis. See if you have a integral transmission cooler as part of the coolant radiator. Early F53 (1999, 2000) didn't, and had trans overtemp issues under certain circumstances. An external in-line filter was usually added if this was reported to and serviced by Ford (Ford had a TSB on this).
b) Air filter change (verify water ingestion TSB complied with
). It may not hurt to remove the air tube from the throttle body and inspect inside the tube and throttle body for debris. When the filter gets wet (water ingestion) it usually comes apart and clogs up inside the throttle body.
c) MAF sensor cleaned
. Do this while you have air filter removed. This is hard to get at but is a must.
d) Consider spark plug and COP change. (Look at missfire codes first) The plugs are sensitive to crap (water, dust, rocks, dirt) getting thrown into the plug cavities, then this can cause arcing, missfires. The only cure is to clean the cavities, remove and replace the plugs, and also the COPs. I use Autolite APP-103 plugs and inexpensive COPs from e-bay (10 for $47)
If you're up to it, consider replacing both the CAM and Crankshaft position sensors. These are reasonably easy to get at, are inexpensive, so what the heck, they are 20 years old .
Your F53 should be similar to my 1999 F53. You may be interested in reviewing my blog site for other maintenance items on the F53 that may pertain to you.
1999 Southwind 35S – Southwind by Fleetwood – sporting its new paint job