would a chain slip cause low fuel pressure?

 

No, I don;t believe so - if the chain slipped - low fuel pressure would be the least of your worries.

 

then it must be the pump or a hose connecting to the pump or the nylon screen got water on it

 

There are only 4 things that can affect fuel pressure on this system:

-- fuel filter
-- fuel pump
-- fuel pressure regulator at the rail
-- fuel pump power/ground lead resistance

 

And #5 / #6:
module(s) that drive(s) the pump (STR has 2, others just 1)

Don't rush to suspect the module(s). You tend to get codes if bad.

 

its not the module but its not the main fuel pump (RH side) could it be the LH side pump?


edit: update: put in a new fuel pump on RH side, ran for codes, heard noise in engine, figured out it was the tensioner which means the chain slipped which mean the cam is out of order causing a miss

 

OK - I'm somewhat confused... You replaced the fuel pump - heard a noise and now you think it's the tensioner? Did you pull off the cam covers to check for alignment of the cams as mentioned above? (You would have to turn the crank to see if the cams are aligned)

To add - if the cam/chain skipped a tooth - you wouldn't only have a misfire, but multiple misfires across the cylinder bank and your engine would run like crap. If I recall correctly - your original misfire was only in Cyl #4 - correct?

 

Too add... Regarding Cyl #4 (Passenger Side - most rear coil) - this cylinder and Coil #8 (Driver's Side - most rear coil) are most susceptible to oil intrusion into the spark well - I would double check the spark well with a flash light/inspection camera - any oil (even if it's sitting at the very bottom of the well) is troublesome and any rust color soot in the spark well or on the coil boot is indicative of water intrusion - which is also troublesome for the coil.

Keep in mind - any of these coils can exhibit intermittent issues at start up but more so when the engine is hot.

 

I agree! Before you give up pop one of the cam covers off and take a look.

It's well worth your time at this point.

Maybe even post a picture or two?
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ill see what i can do.... sometime this week or weekend ill pull that plug out and look inside