Mitsubishi Repair: TE 3ltr v6 stopped, compression test, nrma

Question
have a TE 3ltr V6 magna I purchased in 2001. It has been a fantastic reliable family car, and 2 years ago I had it converted to LPG, or dual fuel to be correct. Recently (About 2 months and 3000ks ago) the water pump was leaking so I installed a new one and replaced the timing belt at the same time. All was going well until I turned a corner and started to pick up speed, and the motor just cut out, and refused to restart. I checked the fuses etc, and then called the NRMA, the road service guy tested the injectors to see if they were pulsing which they were, he then checked for spark, and said that it was there but rather weak. He then checked the coil, and said it was fine, so then sprayed some aero start after removing the air filter, but the car failed to fire at all. After rechecking the above we tried the aero start again but to no avail. He said if you have compression, spark and fuel it must start, so we had spark, and fuel in the form of aero start, so if it was not firing, perhaps as I had done the timing belt myself, he felt it may have been lose and jumped a few teeth, and put the valve timing out, so he suggested a compression test, and checking the timing belt again.

I have since done a compression test and all cylinders are according to my old gauge are between 160 and 170 psi. I have also checked the timing belt, but it was still tight and all the timing markers, on the bottom, and tappet covers line up, and the rotor button points to the No: 1 lead, but it will still refuse to start. I currently have the less than a 12months old good quality batter recharging after winding the motor over for so long, and I am yet to try another key. But do you have any ideas or suggestions? The car has never done this before, and after making sure it has fuel and spark, and that the timing still appears to be OK, I am unsure of what to do next

Answer
Liam,
If you are getting fuel to the rail and injectors, and after cranking it for so long without starting, you've most likely fouled your spark plugs.  You should replace your spark plugs (and plug wires if over 100kms).  Also, check your mass air sensor to be sure it's operating properly.  Check for any clogs in the air intake.  Replace the air and fuel filters to be sure those are flowing properly.  Also inspect your throttle body assembly, throttle position sensor, EGR valve, and PCV valve.  You should also inspect your cam angle sensor to be sure that isn't giving a false reading to the car's computer (ECM).  If all of that appears to be in order, my final suggestion would be to have your ECM inspected.  
Good luck!