freelander 2004 2.5

P0300, P0301, P0303, P0304 did a full tuneup the problem still the same , same code ..running very poorly . The power just dropped off and now it idles very poorly and loud . It cannot be driven also P1472and P1471..replace both VIS code no longer present ........the freelander also engine service light on and a flashing oil light ..after 50 MPH the car shake a lot . cylinder #5 spark pug had oil on it when I pulled out ,,,, also has a thermostat leak .........what else do i have to look for misfire?

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The Freelander's engine does sound poorly. First off, what is a Tune Up? There isn't much to tune up in the traditional sence, the engine is computer controlled. You are obviously getting misfiring on multiple cylinders. The oil pressure light is showing and you have a coolant leak. Has the coolant run low? Is there water in the oil? If so, I suspect that the head gaskets have been cooked. The Freelander's V6 will not tolerate low coolant, even for a second.

yes coolant run low before ..no water in the oil ....i changed the VIS motor it was my first issue....tuneup...sorry just spark plugs and coils..