Going uphill triggers check engine light and shaking

Hello everyone. I am new to this.i have a 98 Tacoma and when I am driving up a hill my check engine light flashes and truck starts to shake. Doesnt downshift to a passing gear either. When I level out and turn off the cruise control it stops and runs fine. any ideas on what it could be? I appreciate any suggestions. Thanks

 

Check engine doesnt stay on after?

 

Turns off as soon as I level out and shut off cruise control

 

You've already solved your problem. Don't use CC on a hilly road.

 

Yes automatic and overdrive. I was told to drain tranny and check for shavings. changed oil and filter about ten thousand miles ago

 

Do you have this problem when you go uphill without the cruise control being on?

 

That doesn't help the OP much. CC isn't supposed to trigger the check engine light going up hills. While I agree turning it off on hilly terrain is a good idea (the transmission will thank you, and your wallet) this isn't what is causing his issue.