Once a week or so I will be cruising along minding my own business and the engine will momentarily die . It only lasts for maybe a second then I go on my merry way. The check engine light comes on when this happens .

I pulled a 121 code. What should I check ?

Dew.

 

I assume you mean P0121???

That is a generic throttle position sensor code.

I assume that would indicate an APPS malfunction. Have you tried an APPS reset??

May help out. Otherwise you are going to be saving pennies for a new APPS I'd say.