Check the fuel pressure. Disconnect the catalytic converter and test drive it. If the power comes back, you'll have to replace the catalytic converter.

Answered by rivermikerat (expert)
5,494 answers provided

So, it could have nothing to do with the fuel pump? Because I want to see if replacing the fuel filter will bring back the power. If not I know for sure it's the pump. . .

Response from Junior197
1 question asked

A plugged catalytic converter will cause your engine to lose power under load. But, so can a fuel pump that's not delivering enough pressure, or a clogged fuel filter. Temporarily removing the catalytic converter will either eliminate it as a suspect item, or give you your answer.

If the cat is eliminated, next is to check the fuel pressure. This will tell you whether the problem is related to fuel pressure delivery. If the pressure is low, the problem could be either the pump or the filter. The filter for your vehicle averages about $12, so if the pressure is low, we start there.

Answered by rivermikerat (expert)
5,494 answers provided