Help!! Mazda Tribute 01 Backfires

[sscorpinok]

Ok, so I have already spent tons of money on this mazda.

items:

5 injectors
catylitic converter
muffler
4 oxygen sensors
1 maf sensor
k & n air filter
egr valve
radiator
3 ingniton coils
2 coil boots
lower intake manifold


It was running fine until I washed the motor after work, turned it on after I washed it and it backfired a couple of times ,then it stutter like a classic camaro with a 305 motor . I still had to drive 20 miles back home so I got on the highway and it felt like the egr valve was going to pop becuase it has happen to me before,it would stay at 50 with 3-4 rpm's .Got home checked the spark plugs and one spark had oil ,so I figure it was the valve cover gasket and grommets so iI replace it ,only the grill side.

I have the other side too but I figure once I turned it on it was going to work but it didn't,so I need a next step,or do you think by replacing the valve cover gasket,it should work better?
I 've search the internet for answers and I found the mazda forum!!!!

 

[CorkSport]

I am guessing you have a V6 model?

 

[sscorpinok]

yes

V6
3.0
SUPER CHARGED TURBO

well today ,I replace the valve cover gasket and grommets on the firewall side,I took out the sparkplugs to see if they had oil like my other spark plug did and it did.
I just got these spark plugs about 3-4 months ago ,double platinum bosch . Do you think wire brushing them is okay? One of them did have oil at the tip and it looks like the heat pentrated it on there.
I did not have time to finish before it got dark,I will just have to see tommorrow.

 

[sscorpinok]

Sounds a little btter but now it backfires on drive,small backfire
its goes 30 mph on 2 rpms ,what you think next step is? Starts smelling like charcoal. I know you're thinking converters but I just had them done.

ignition coils,fuel filter,oxygen sensors had done too unless the dum part store gave me wrong ones, (down stream,upstream)

anything i can do to check out pipe exhuast? make sure its not clogged up...?