I bought this Jeep 2 years ago.
It was running dually on LPG and Petrol.
Right ater I bought the Jeep, I realized that the LPG doesn't fit:
Frontfire occured periodically.
The engine temprature got too high (when driving on tarmac).

Then, I decided to remove the LPG and have it run on petrol only.

Since then, multiple problems occured:
1) Coil number 2 didn't ignite a spark (the coil was replaced).
2) There has been a problem in the minus of the electrical harness (harness was fixed).
3) Then, I faced the following:
The engine seems to run OK, then when stopping some of the pistons stop working.
Then, when turning the engine off and immediately on it seems to run OK.
At the next stop some of the pistons don't run again.

Is this a known issue?
Could it be that the removal of the LPG caused this problem?
Is there a specific part that may be causing this problem?

I'm quite desparate because I already changed 2 engines and the problem remains.

 

What year and engine?
You changed two engines? What parts did you carry over and retain?
The LPG conversion I assume shuts down the injectors when in operation, is there are control box of some sort?