Hello, I have changed the Crankshaft Sensor as well as the camshaft sensor, all new spark plugs, checked every coil pack with a good one, tested a spare RCM and re-soidered mine (Paul D did the work) Also replaced the fuel filter and checked fuel pressure which was at 52 psi. Can not find any vacuum leaks but cylinders 1 2 3 are not firing. Can unplug all three coil packs on that side and it does not change how it runs. It is smooth as can be at 1,000 rpm and up but will not idle proper. If you rev it up to 2,500 it will hold it for 5 seconds and then drop down to 1,000 and cycle like that as long as you want to hold it there. Anybody have the same situation and now what to try next ??