So any help appreciated guys,
There's countless posts on misfiring on this site and I've viewed most of the ones I've found, to no avail.
Engine details: RB25DET S1.5, ECU is Haltech E11V2, running a MAFless tune, Garrett GT3582R, Upgraded Intercooler, GFB manual Boost controller, Tial EWG 63mm, Nismo 740cc injectors, 3BAR MAP sensor, Bosch 040 fuel pump, Sard adjustable fuel reg (with gauge (set at 55psi) HKS Oil cooler and remote Oil filter, Splitfire Coils, NGK Copper plugs gapped at .8 with 21KMs on them.
So car developed a missfire last week, over fueling, hesitating at all operating temps (biggest from TPS 0 to >2) from startup to shut down with a rich and lean pops in exhaust, surging during acelleration and cruising. Checked usual culprits in order; Coils, Plugs, Tune re install, Vacume and hoses, Fuel Reg, Compression test, Injectors Flow tested and inspected All okay, TPS sensor, Coolant temp sensor, Air Temp sensor, MAP sensor, related wiring, AAC valve, replaced Fuel filter, and ECU checks out.
Nowe I havnt done the CAS, as I was under impression that a faulty cas will cause problems with starting, and it starts like nothings wrong. The BOV has been on for 4 years (was on car when I got it) and never had an issue with it before) have checked to make shure Diaphragm in Fuel reg isn't totalled and it's all fine. And no it hasn't had an o2 sensor on the exhaust (ecu) since acquiring it. The air fuel mix at idle is around 10.8:1 richining on throttle depress. All sensor have been tested with Multimeter and viewing on the Ecu both are in sync.
Cars in Red Center Nats in a month so would like to have it run by then.
Any help appreciated