I bought a 99 grand limited with a bad 4.7 ,bought a 2000 Durango 4.7,it was crashed hard in the front,replaced cam gear retimed motor.it starts and runs but act like its hitting on 4 cyc,drivers side show power but I can pull wires off the goils and there is no change to the motor,if I pull any from pass side it will stall,ive replaced the cam and crank sensor but it didn't help any,thinking the ecm is bad,no code showing any help would be great......man I miss my wrangler

 

doesn't the 4.7 suck!!!! My sister blew the head gasket on her 02 wj limited 4.7. How about that hydraulic fan? I don't think your 99 has it.

4.0LHO FOREVER!!!

 

Might try posting in the Grand section.