Misfire into multiple cylinder!

[maxthehax]

Till last week something started. Sometimes when on low-mid load, the engine feels like it cut-off for a second only, and it started to bug me. I was still able to drive it normally without major problem.

I though it was my MAF getting too dirty, so I cleaned it. It did not cure the problem and Im not sure if it helped. Car was still driving perfect except that little cut-off.

Today, I started to intall my oil cooler. I did not finish the job because of a malfunction in a part. So I simply put back my oil filter and some intercooler piping on.
Batterie was plugged all the time.
I cutted, I grinded, with 2 tools, a grinder and my dremel.
And I played with my oil filter...

Those things are the only one I did... This morning I start the car and it runs like a Cam'd muscle car or a subaru.
3 CEL; P0300, P0302, P0303, well I think they are all missfire into one or multiple cylinder.

Could I have damage something electrical? Coils, or the FIC? Maybe a fuse? Because I used my electrical tools on the car.



This morning when my car was missfiring like shitt, I started by removing all intercooler piping, clean the inside, reclean the MAF.
Now the problem is almost gone, I can take-off from the first gear, and the engine idle a lot better. But it is still not good, on load it look like it missfire/cut-off.

I will try to change that MAF for a new one, also I think it would be good to change my O2 sensors they are old as hell.