2.4l p301

I have a 2000 olds alero 2.4l. i get 2 codes p301 and pending code 301.
service engine light and trac off light. it runs rough, exhaust smells like fuel.
I have used a multimeter on the coils, checked the primary and secondary resistance on the coils and they check out fine. I have also changed the plugs, the wires, flipped the coils, switched the fuel injectors around, still no change. it has been this way for a few weeks now. once it did run normal, no lights, smooth running, it ran good for about 15min. then the lights came back on. any ideas?

Is this the Ecotec engine or the Quad Four engine?

2.4l LD9 quad 4

is the [trac off] light related to the engine problem?

Trac Off comes on when when a misfire code is set....

Replaced wires? There are no wires....unless you mean the boots..

Checking coil resistance is only one test.....need to check coil output, that takes a set of test wires.....

One thing this vehicle has a problem with, is the tower cover.....this is the cover that the coils sit in.....

If the misfire is on cylinder#1, compression is ok, a new A/c delco plug is in there, try swapping the coils in the housing.....if you still get a misfire on #1, could be the housing....

After replacing that, if you still have a misfire, could be an injector problem....but I'm leaning towards the cover...

i will try a cover next.

and misfire doesn't mean not fire? also previous owner didn't tighten up the brake caliper bolts and 1 fell out so i put a new one in then the trac light went off...for a half hour, also the cel wasn't flashing...but i am putting in a new coil housing cover tonight...so hopefully it will be fixed

all fixed...thanks for the help