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My 1996 Buick Skylark Custom 2.4L Twin Cam engine shakes and rides rough what could be the problem. New Bwd sensor,coil pack and module,and Spark plugs.

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Jodesha, Should have scanned for diagnostic codes, have engine and transmission mounts checked. Check for vacuum leaks and or injectors could be a problem.
Check the attached links,instruction and guides on diagnosing rough running engine. Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

How to Fix Rough Engine Idle Problems at YouFixCars com

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

The Lost Art of Diagnosing Engine Problems

Rough Running Engines Car Repair Information From MasterTechMark

Posted on Apr 07, 2016

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Posted on Jan 02, 2017

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I have a 93 Buick Skylark GS 3300 Engine Series and my car is cranking but not firing. Diagnostic scan turned up a DTC42 code-spark timing error. The spark plugs are not firing. Replaced crankshaft sensor...


think a timing belt slippage or camshaft position sensor,
deffiantly something there to take a deeper look at.
double check the cams and their alighnment marks that they alighn with TDC if out of sync. nothing will fire right,the coil pack has no ides where anything is for some reason,good luck with this one,Gary

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Are you getting gas and spark to the cylinders?

If you add gas to the throttle body, does it start?
If so, then you have a fuel pump delivery problem in this vehicle.

If it doesn't start, then you may have a spark problem at the spark plugs due to a coil pack going bad or a module (but you said you changed the module).

Also, is this a 1995 Buick LeSabre of a 1993 Buick Skylark (which it is listed under)? What engine size is this?

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