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hello i am working on a 2000 ply neon 2.0 engine w/ auto trans.car vibrates in drive at idle.
all engine mounts have been replaced. i have also replaced plugs and wires.
 

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Like an engine vibration felt inside the car?
Make sure that the exhaust or something on the back of the engine isn't contacting the firewall/floor when in gear. The engine/transaxle tips back when put in a forward gear,
The motor mounts are adjustable in slotted brackets if a metal-to-metal contact is occurring. The engine/transaxle can be moved right/left or tilted forwards/backwards slightly. Don't move more than a 1/4" or the axle joints may bottom out.
Use a pry-bar to move the engine/transaxle around while someone is inside the car in drive and listening for changes in the noise.
 

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Will giving the car gas, or putting it in neutral make any difference? It could be that the engine is struggling to stay running (for a variety of reasons, choked for air/starved for fuel, vacuum issues, etc, etc) with a load on it.
 

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EGR problems can cause a particularly rough idle on the Neon 2.0.
 
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