2001 pontiac grand am 2.4 cyl spark plug wires

change ignition module

Spark plugs,wires and injectors, have nothing to do with your problem

PO303 is a misfire on cylinder #3
You may have an individual cylinder coil for that cyl or a coil pack for
several cyl,don't know the engine you have.

You may also have other issues that are causing the shaking

if its white smoke look for coolant getting into the cyls, black smoke could be leaking injectors

this should be a 2.3 which has the spark plugs under a plastic cover on top of the engine, the ignition coil is inside this cover.

Check the spark plugs, make sure they all seated and are tight. Also change wires. Probably the coil packs, but check the cheaper stuff first.

What engine? You need to have it scanned for codes. Autozone will do this for free

1-2-3-4-5-6

1 3 5
2 4 6

three distibutors- 5/2 3/6/ 4/1

------>>>FRONT>>>>of Van >>>>

______________________________
#5 cyl #6 cyl

#3 cyl #4 cyl

#1 cyl #2 cyl
______________________________
_________________
I COIL BLOCK I
I I
I #3 #1 #5 I
I I
I I Firing Order Is
I I 1 2 3 4 5 6
I #6 #4 #2 I
I _______________I_

the Wires Go Accordingly to prospective Terminals, So Sorry Unable to Send Pics through FixYa, A Formating Problem Exists
and they show on my end but not on your end this is TRUE and CORRECT To The BOOK other than the Lines from Coil to Spark Plug ENDS at CYLINDERS. Please dont Forget to RATE Me
Thank You And Happy Motoring!!

here u go.

remove the top cover that says 2.4 L on it, the spark plugs are underneath. Like me, you'll feel like an idiot for not knowing.