Shakes when running

run the fault codes
indications are injector problems either wiring , or blockage
check fuel pressure as it could also be from low fuel pressure , problem pressure regulator , blocked filter or EVAP venting problem

A vehicle shaking is usually sigh of misfire, but I it would take three pistons out to make a v8 shake.
If you run it, see if the exhaust smells like rotten eggs. If so don't run it or it could blow the cat converter.

Hello Greg, It's only a guess, but I think you might have a misfire on one or more cylinders causing your shaking problem. If your check engine light is on you may want to run a code scan.

I really need to know the mileage.....?..also the question isn't very clear ...Is the whole truck shaking roughly or is the engine shaking roughly or is it both the engine and truck shaking..?..Since I am not sure I will answer what I can....Ok......If the truck is shaking while sitting still at idle the engine/trans mounts could be worn and or loose mounting hardware...If the engine is running roughly at idle causing all to shake that bad it could be a number of things causing it as usual...Quite often a faulty plug wire/and or bad plug will make it have a misfire because it will be running on only 5 cylinders..If that's the case it could be more than one bad...A vacuum leak will cause it to perform in the same manner...however all cylinders will be firing..Normally a vacuum leak is easy to pinpoint..however it could be a faulty IAC valve..(IDLE AIR CONTROL)..The idle air control is designed to hold a high idle at start up then slowly bring idle down to proper Rpm.....A faulty TPS (THROTTLE POSITION SENSOR) will also cause a rough running problem..And let's not forget the O2 sensor..(OXYGEN SENSOR)..The O2 sensor controls air/fuel mixture...and yes an exhaust manifold gasket will make it run rough but not too bad...It has a rough running sound more so than causing it to horribly shake..It will shake but not to bad..
it is located at the exhaust side of engine..The exhaust manifold is mounted to the engine exhaust port..the exhaust pipe is mounted to the exhaust manifold and the muffler/cat converter is mounted to the exhaust pipe...You can check the plug wires quickly..With engine running carefully remove plug wires 1 at a time..If the sound of engine gets worse the wire you removed is good..after verifying it is good or bad plug wire back on then pull the next wire..and so on..If you pull a wire off and there is no change in engine operation that is the bad wire..If that is the case change all plugs and wires...One at a time..(It is a good idea to make sure all wires come off easily before starting engine..old wires will come apart easily..grasp wire tightly at boot and twist left to right while pulling..)as far as the other components I spoke as well as many others,the best,easy way is to have it hooked to a scanner and they can check/test all components for proper operation...Now..If it runs good but is shaking the engine/trans mounts are worn as I stated earlier..any loose engine component will cause an engine shake also but you should notice it at a glance...engine mount bolts/nuts being loose can be tightened without changing mounts if caught in time..Trans could be coming loose.also worn clutch will cause vibration...Send more info and I can guide you to remove and replace any faulty components you may find to save you money.........Brooks/Metalpoet.....

There are two types of car shake
1, stop idling shaking, this situation is generally low or lack of cylinder engine idle speed. Misfiring need to check the spark plug and the high voltage line! In addition, the nozzle and the solar term door dirty is easy to appear this kind of circumstance! Wash!
2, the driving time jitter, the chassis and a relationship! Because the rod or swing arms open, do a four wheel positioning can be solved!
source: obd2 tool car diagnostic tool

Struts

The moun sounds like it is probably bad. But you are addressing SHAKING. Most motors don't SHAKE. It may have a miss to it or not be running smoothly. It may need a tune up or have bad gas. Just remember this car is 12 years old and may need some simple TLC.

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I have a 1989 5-series BMW which sometimes stalls after changing from reverse to drive. It also sometimes shakes when first driving in reverse before changing to drive.

Check your tires and alignment.

spark plugs wires needs complete tune up also synthetic oil change not designed to run on regular oil then check bearings