99 Ford Ranger XLT (Flex)
When going up a hill the Check engine light comes on and the power drops off. Any ideas s to why? There are no codes stored in the computer and once over the hill the CEL goes off and power comes back

 

Is the CEL flashing?

 

No, It comes on steady
but now that you brought it up what does the flashing mean even.

 

A flashing CEL means that the PCM is detecting misfire in real time. If it goes on long enough during 2 successive drive cycles, a trouble code will be stored.

 

I'm willing to bet that you are having a misfire, and that a change of spark plugs and possibly wires would fix your problem.

It could be a lot of things, though. If it comes back, hopefully the code gets stored.

 

Thanks guys,
I put in new plugs today and so far no problems.