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Message: [QUOTE="maplemale, post: 1539452, member: 17366"] Here's my current working theory and question + a little more info from my test drive last night: First, some more info: The RPMs climb steadily until until about 2200rpms. At this point, the truck instantly falls on it's face (lacks power), the duty cycle spikes instantly to 50%+ and the PSI instantly spikes from around 2200PSI to 3400-3800PSI. Once the RPMs reach about 2400-2600rpm while climbing much slower than they should, everything goes back to normal. The Duty cycle drops to 30%-ish, the PSI drops to about 2400psi-2600psi and climbs steadily. The power is back and the RPMs start steadily climbing again as expected. Now, working theory: Seems to me it's physically impossible for the HPOP to jump from 2200PSI to 3400PSI+ in a nano-second. That's a 1200PSI jump in zero time! Therefore, it seems to me this reading must be wrong. If it's wrong, this must be coming from the ICP? Therefore, the computer would tell the IPR to back off the pressure and you'd instantly lose power. At least, i think that's the function of the IPR... Any issues with that theory? Now for my (hopefully) final question: How can I validate this is the case without just flipping for a new ICP? I know you can unplug it for no-start issues. But, how is it going to effect things driving around and mashing the accelerator with the ICP unplugged? Also, is it plausible I have a wiring issue / bad ground etc, that could be causing the issue on the ICP circuit or even the IPR circuit? [/QUOTE]