im still workin on trackin down my stumbling, my CPS readings came back 197ohms and .2vac ... so the volts while cranking was way off.

now i go to the auto parts store and they ask me if my truck was the high altitude model .. how do i know for sure??

the owners manual seems to have been filled out by a couple in Colorado ... whats the difference? would it run poorly if i got the wrong one?

 

its only needed if youre in high altitudes. some people use it to squeeze a tad more timing out of the motor as well