Hello all , I’m trying to diagnose my blazer , and perhaps I may need to purchase a scope , feel free to suggest a cheap but functional brand .

I will be driving along a gravel , bumpy section of logging road about 40 to 50 Km/hr at light steady throttle and suddenly I can feel the throttle drop out ,

I will push on the pedal and it will not respond all the way up until flooring it to get some response but very buggy until I let of the pedal and it all response returns to Normal , it will go in and out intermittently I’m assuming from vibration. ?

I have a spare throttle body and with tps and iac so I swapped it but no change

put a new tank and pump in due to a leak but no change .

 

This is a portable and inexpensive way to see basic low voltage behavior with limits:


This is a more robust choice:


For secondary ignition you need a set of high voltage inductance probes:


I have and use all 3 of these. That said, I dont think that this is were you should start. Drop out from a bumpy ride implies something that is loose, corroded, mechanically faulty, etc. I would start with live data monitoring during an event to see if a sensor drops out or you get any other clues.


George