No engine response
I know the question may be a little broad, but here is the problem I am having:
The timing belt needed replacing on my 2.3L engine (95 ranger 4x4) I tried replacing it myself but gave up when I could not get the crankshaft pulley off, but in the process got it out of time. So I took it to a place and they got a new one on, realigned the timing, and now it really does not run. It will idle, poorly, and will not respond at all to the throttle, and I mean no response. The shop had tried realigning the timing numerous times with no effect, has swapped out the plugs/coil packs/plugs (they were really old), and still no improvement. Tomorrow they are going to try a new mass-airflow sensor. The engine gets good compression, so it seems unlikely that the timing is really off at this point, unless it is off by 180 degrees. Here are some thoughts, but does anyone have experience with this issue?
Throttle-positioning sensor could be out
O2 sensor could be bad, right now the engine while it idles, runs very rich
Catalytic converter could have plugged itself creating too much back pressure in the system
I really am at a loss here. The shop has spent more hours than I care to imagine and they do not understand it, even bringing in a Ford Master Tech who found himself confused by it (fortunately I am not paying for all the diagnostic work).
Any help that anyone could offer would be useful, I really am at a loss here.