Hello I' m new here. I have a 1991 Ranger with a 2.3. My problem is that under 2500 rpms the motor has no power, from dead stop I have to rev to 3k let the clutch out, the truck will start to move but motor bogs down, re clutch re rev. I have to do this like 3 times. The engine also seems to be sputtering and hesitating under 2500rpms. The truck will not maintain speed under 3000 Rpms . I have replaced spark plugs, wires, ignition coils, tps, egr and solenoid. Any help you can give would be greatly appreciated. Thanks in advance.

 

Welcome to the forum

It reads like you have low compression.
When was the timing belt last changed?

2.3l Lima SOHC engine uses a timing belt to get high compression, 160psi +
If that belt gets loose or skips a tooth then compression drops and power is gone.

If you have a vacuum gauge you can test compression by idle vacuum, 18-20" of vacuum would be expected

If it was a fuel issue you would loose power at higher RPMs, higher fuel flow required
If you had a clogged exhaust, same thing, idle would be OK but you would lose power as RPM increased and back pressure increased.

Your description is that you are, in essence, running the truck on crankshaft/flywheel momentum.
You have to build up momentum, spinning speed, in the flywheel so engine won't stall out when under load.
I would either test compression or test vacuum