Forward- Vehicle involved-2005 Jeep Grand Cherokee, 5.7

About me – Retired now x-auto-mechanic; have been working on and with all types of vehicles since the ‘80s, so my extensive experience is of great value to me when it comes to knowing another credible auto-mechanic.

Early Sept 2021, we began experiencing new issues with this vehicle, in short:
1. The throttle acceleration would sporadically jump (as if one was to tap the gas pedal on and off) and then for no reason, die.
2. The vehicle would die unexpectedly no matter speed or angle.
3. Would not hold a steady idle.

I researched for about 4 hours in addition to speaking to a couple of 30+ year ASE Certified Jeep mechanics who, after reviewing everything were very confident it was the PCM and not the ECM.

After speaking to John (Owner of “MasterTech Auto Repair”) in Harrison, AR. he was confident that he would be able to determine the issue fairly quickly over a few days.
John updated us indicating although right now he was leaning towards the ECM being the issue, he only felt 75% confident. He also mentioned he was noticing some fluctuating voltage in the throttle body. In any case, he wasn’t satisfied just yet and asked if it would be OK for him to continue his deep diagnostics and troubleshooting until he felt confident of the cause. I told him to keep it until he felt absolutely confident of his diagnosis because I wasn’t going to spend money on an ECM or PCM if that didn’t resolve the issue and he completely understood. 2 more days went by and b/c of his personal persistence, he said he was absolutely confident the issue was in-fact the throttle body.

The decision to take it to MasterTech Auto Repair was the correct choice and most affordable and effective choice and resulted in the complete satisfaction of this customer all due to John’s steadfast insistence not to be partially satisfied but to be absolutely satisfied with a cause and resolution.

I personally and HIGHLY recommend them to anyone.