Help with my DD a 2k Bonneville

[Egreen99]

Car was running fine then one day threw a ses light then went away after a day, did this for a couple days, always ran fine.

Then one day it started to jerk pretty bad got it read at autozone and it was P0304 #4 misfire.

changed plugs, wires from Napa ngk plugs and napa wires, car ran fine for 7 days then all of a sudden shut off on the highway after if jerked for 3-5 seconds. Started back up and drove home.

since then:
replaced Ignition control module
cleaned maf and EGR
changed coil pack for #4

still throws code P0304 WTF!
it's pissing me off now, car has sat for 4 days if not longer. it jerks so bad and shaked that you cant drive it.

has new upper manifold and gaskets, no coolant loss at all. Oil is perfect and coolant is perfect. bone dry lim gaskets..

can it be a bad fpr or injector? spark plug wires are not touching any metal at all.

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[IZZy]

sounds like you covered most of the usual suspects, dunno what to tell ya.

 

[SecondMustangGT]

Get the engine hot then check the resistance of tall the injectors. If one is too low it will overheat the ecm and shut the car down

 

[01GTvert]

sounds like the #4 injector. Swap it with another one and see if the misfire follows.