I've had a missfire and some issues with knocking for a time no but they got put on the backburner due to a move

So I finally get the time to use the cheapy code scanner I got and it came back with these codes,
0172 bank #1 too rich....
I am assuming bank #1 is the right bank because I also get the code

0304 missfire on cyl#4

and on start up code
0300 random multiple missfire detected.....

Im going to start checking for loose wires and such but If any of you have Ideas to better assist me please let me know.

 

ttt for myself

 

Bank 1 is the left bank.

#4 is on the right bank as you probably know. If you have not done plug wires in a while, it may be time. Also look down into the opti terminals for corrosion when the plug wires are removed.

 

the opti, plugs and wires have less then 5,000 miles on them. allthough I know they have gotten wet because I had a problem with a leaky hose that took me too long to find.

 

ttt

 

You might want to review this thread and limit "TTT" to no more than once in 24 hours.

 

24 hrs later and I checked the spark plug wires and they are fine. any on have any more ideas b 4 i tear into it tonight

 

Remove the plugs and check them carefully. It is a big pain with my headers but you can get a spark plug socket on Ebay for $5 which is a lifesaver! Check for any hairline cracks on the porceline of the plugs (the white part). Also, look carefully at the the center and side electrodes. Sometimes they can blow apart and cause a misfire.

Worst case scenario is that you've got a head gasket letting loose and the coolant is blowing out your spark. Worst Case.

When you remove your plugs, make sure that the tips look tan-brown. Any black slime or black powder is bad. A very clean plug is also bad and can indicate a blown head gasket.

Do you have any bubbles in your cooling system? Those can come from a blown head gasket too... are you adding coolant?