I'm in need of a scanner like this to diagnose idle problems on my 92 C2500 (5.7, 700R4) I recently acquired. It's only got 105k and original paint. Motor and trans appear unmolested with zero mods. Would this SnapOn scanner help with this problem since it doesn't seem to be throwing and codes?
The issue I am having is when it is fully warmed up, it seems to miss or skip a beat about once every 20-30 seconds. I do not notice it while driving, only while idling in park or in gear (drive or reverse). It has never quit running while doing this, even with the AC running. The truck starts easily and warms up in about 10 minutes. I have replaced both of the coolant temp sensors and the thermostat. The temp gauge stays about 150 when warmed up. I also replaced the cap and rotor with AC Delco parts, the old ones appeared to be in good shape, maybe 4-5 years old. From here, I am considering the fuel pressure regulator or fuel filter just because I think they are original.
I check the OBD blinking light and only count 12, 12 12 so no codes. What other troubleshooting steps can I take before throwing any more parts at her?