Nissan Pathfinder Questions

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Tested batt/starter good. Was starting fine until pulled starter to replace tranny. Jumped spins but doesn't engage the flywheel. Could it be starer relay
My jeep was working fine and then as i came out the grocery store it wouldn't fire up. I ruled out the battery after i realized all the lights, AC, windows and stereo worked fine. I even tried to jump start it with no luck. I don't even hear the starter trying to work. Checked all my fuses and they seemed fine. My friend suggested that the immobilizer has been activated for whatever reason, which i don't know why cuz i only own original keys. Can somebody please help. I don't want to have to get a tow truck to pull it to the dealership so they can charge me an arm and a leg to get it working in 15 minutes. Heeelllllpppp!!!!!!
Checked fuel lines for leaks can accelerate slowly try to accelerate fast and car will stall hard restart idles fine

Notice yesterday when accelerating it didn't have the same pick up that it had the day before
1. 0 - 15 mph it shift into 2nd gear.
2. From 15 to 30 mph it shifts again but from 30 to 45 mph it doesn't shift, it high rave.
Because the overdrive doesn't shiftat high speed.

is this enough info
The tachometer won't rev over 2500 rpms after it starts acting up. I have already replaced the fuel pump, fuel regulator, spark plugs,rotor and rotor cap, throttle position sensor, IAC which was faulty, and the fuel system has been thoroughly checked!
The 3.3ltr engine cuts out intermittently when running on Petrol, it has only just started doing this, it will start again without any trouble after putting it in Neutral (or parked if stationary) it mostly cuts out when backing off at traffic lights or corners, I have replaced the fuel filter, fuel pump, pump relay, road tested after each replacement, still the same, 12v is still getting to the pump when it stalls, is there something else that needs periodic replacement in the fuel system chain?
other; engine lamp comes on erratically and goes out when it feels like it no pattern to it, could the 2 be related?
As mentioned above, the engine runs fine on Gas (LPG), it is on dual fuel and there is absolutely nothing wrong with it when running on LPG. . (PLEASE NOTE..I am in Australia, I had to choose a bogus "Zip" code to be allowed onto this site, I hope that is not going to be a problem? my actual location is Alice Springs NT Au, Post Code 0870)
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