I have a real nice Discovery 2 I have had for 7 years. I installed a lot of new parts valley gasket, new injectors, power packs water pump, power steering pump, sensors, it was running great for a while.

Took it out on a long ride and it started running in less than 8 cylinders, replaced all spark plugs and now it will not even start. When I try to get it started now, the engine seem to reach a point where it catches on something and slows the starting speed, no loud noises.

Where should start I got a lot of time and money invested on this D2 and like the vehicle but don't know if this is a major failure or not. Any suggestions?

 

I would crank it without spark plugs in place first, to check engine spins freely, watching carefully if the plugs do spark away from their holes while cranking, and no coolant gets spit out. There is a chance wires got damaged if pulled other than from their boots. Next is measuring compression and cleaning the battery terminals tight.