90 dodge caravan loss of throttle control

My farm family Truckster is a 90 dodge caravan
3.3 v6 . auto with 286k. My dream of pushing
it to 300K is about to be crushed, literally,
because of a strange lack of throttle problem.
About 2 years ago I would notice a "lack of
throttle" on hot days after the car had warmed
up. Now I don't have any acceleration above
about 1800 rpm. I keep pushing the pedal down
until its about 1/2 inch from the floor. At
that point the transmission drops down a gear
and it easily accelerates to over 4000rpm.
When I reach the desired speed I slowly let up
on pedal and at 3000rpm lose any control of
engine speed until it drops below 1800 rpm. My
work commute consists of neck snapping
acceleration, coast at idle, repeat! My family
is all wearing neck braces and drooling when we
pass the new car lots. Any ideas? I think it
is pre OBD II so its not showing check engine
light. Any ideas?
 
Also check for a fuel filter along the frame before the fuel tank. Dodge did that to me with a van I had.
 
If it ONLY does it at operating temperature and it doesn't buck or kick, I would block off the EGR valve with tin foil and take it for a test drive.
 
Might take a look at the throttle and transmission cables. Have someone operate the throttle from inside (engine off), watch the actual throttle plate move and the movement of the transmission cable. Here is an adjustment procedure, if it's correct for your model.

http://dodgeforum.com/forum/1st-gen-dakota/223570-throttle-valve-tv-cable-adjustment.html

Is there a check engine light on? If so follow up on that.
 
Thanks for the tips. I forgot to mention I already changed the fuel filter and no change. One thing I can't figure out is why once it downshifts it'll easily accelerate to over 70 mph. But once I start to let off the gas below 3000 rpm I lose throttle response. Could this be a TPS issue?
 

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