DT466e - WARNING! Aftermarket IPR not so good. 1998 International 4700

SEPTEMBER 20, 2022 Weird surging at idle and hard to rev and DTC 331+.333 WARN light on. Replaced ICP Sensor - same surging. Replaced eBay IPR with original IPR - FIXED! No dash lights and idles and revs great! SEPTEMBER 17, 2022 Bought the truck with a stated "electrical issue". After tracing everything including swapping ECMs and a new rebuilt IDM, still no start. Replaced all the sensors even though no codes - still no start. Replaced the IPR - still no start. Replaced the chunked-out primer ball on the fuel filter housing - still no start. 47psi fuel pressure (at fuel filter) during cranking. 50psi oil pressure at LPOP. So I removed the HPOP and took it apart. NO FERRY PLUG BALL! It was gone! I really didn't think this would cause a complete NO-START issue. Replaced the .25" ball with part 1833830C1, re-installed the HPOP and it started after a few seconds of cranking! Wow. Now I have a 331 and 333 DTC (IPR too high and too low) as stored codes so I'll install the original IPR if those codes come back. Now to tackle a leak at the fuel rail gasket. But it RUNS! Finally! ;-p