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Good morning and welcome to JustAnswer!!!
Can you tell me if the 2002 had a 3 connector PCM and if the 2005 had a 4 connector PCM? If so then your issues are that they are different engines.. The 2002 is a JTEC engine and the 2005 is a NGC engine..
The 2002 is a JTEC(JeepTruckEngineController) and the 2005 is a NGC(NextGenerationController) which means they may look the same from the outside but internally they are different engines.. The only way you could possibly get this running is to swap the tone wheels from the 2002 to the 2005 engine and I mean the crankshaft and the camshaft...
But here at the dealership we would suggest replacing it with the correct engine..
I hope this helps,
The easiest way to tell the difference is to check the PCM and see if it has 3 connectors which is a JTEC.. I get customers that run into this weekly and some pull the engine and swap tone wheels and some get the right engine. Both will plug and and everything will fit perfect but on the inside they are different engines..
Glad I could help,
Thank you for the positive rating so I'm compensated for my time.
Have a great day,
Since I haven't got a reply I'm guessing you have it fixed....
Glad I could help and thank you for the positive rating,