Ford Ranger 94 4cyl engine problem

[BigAaron]

I recently picked up a 94 Ranger, it's a 5speed 4cyl extracab. I got it cheap because it was in a accident. The collision was to the right side front bumper, hood and fender.
The force was enough to break the motor mounts and send the motor into the radiator, but the frame is fine. I replaced the motor mounts and trans crossmember and radiator, and pulled out the body damage. Then we could not get it to start, we narrowed it down to a fuel pump problem. After an hour of troubleshooting we decided to pick up a Chiltons manual, and that told us about the stupid inertia fuel cutoff switch. We reset it and the truck fired right up. It usually idles ok but is very low on power. When you give it gas under load is studders a little and does not want to accellerate. It will rev up ok, if slightly slow, in neutral. We checked both coil packs and all 8 wires have spark. All the wiring looks good, and other then the radiator, the engine didn't sustain any damage in the accident that we can see. It is a rebuilt motor, done only a month before the accident. Any ideas of what could cause this?

[Hellfire]

Have you tried scanning for codes?

[BigAaron]

No, we didn't do that yet but there is no check engine light on.

[matt_helton]

Aaron, check the fuel pressure and see if its in spec. not sure if that has an inline (out of tank) fuel pump or not but if it has the intank fuel pump module sometimes a collision can break the housing causing it to not be able to get up to full fuel pressure.

could also be a plugged fuel filter.

another thing. this is prolly not the case but i have seen a timing belt jump a tooth from time to time in extreme situations on certain motors. all kinds of problems will result. TDC the motor and pull the timing cover and check the marks with to see if its in time.

[matt_helton]

could also have a totally plugged catalytic converter.......just throwin out ideas here.

[matt_helton]

35-45 psi is your magic number.

also, check out the fuel pressure regulator and vacuum line condition and see that it has vacuum. and if you have a hand vacuum pump pull pressure on the regulator and see if the diaphram is good.

[orvacian]

I checked for codes and nothing is stored. I pulled the plugs and they looked good. Then I bypassed the fuel cutoff switch. Checked the resistance on the primary and secondary of the coilpacks, they are good. I reset the ecu codes just for the hell of it. It got a little better each time I test drove it. Now it seems ok, it is a little underpowered but that might be normal for the 2.3l. Thanks for the advice!