Hey guys, I’ve been absent awhile. I had a buddy call me with some issues. Haven’t went to check it out myself yet, told him this weekend. Anyhow, he has a 2000 XJ 4X4 4.0, he put a motor out of a 2001 XJ 2X4 in it. He said it run for a couple weeks but ruff, now it won’t do anything. He has tried different fuel rails, tried a different ECM and replaced the throttle position sensor, he is getting fuel to the fuel rail but doesn’t know how much pressure. I told him it doesn’t sound like a fuel problem to, sounds like firing issue but he doesn’t know how to check the firing because of the rail, not distributor. I also told him since it ran before but ruff to make sure his grounds are are still good and make sure he connected all of them. Before I go to lend him a hand I was wondering if one of you guys have went through this and could give us some advice on where to go? Also he doesn’t have a CEL on, but it hasn’t started. Thanks guys