misfire at idle only

[bgeclipse]

my car had a misfire at idle,rpmgoes from 800 to 700 thats it,i could hear the misfire in the exhaust pipe too,what can cause that?
i already change wires ,replace spark plugs with some denso copper gap at 28
clean air filter,clean throotle body,and none of these help,car runs fine driving around,its just at idle,check engine light is on,so i scan it at work and it shows fuel pressure solenoid is faulty can that be the cause?

 

[njdaewoo]

If thats what the ecu is telling you I would start there first.

 

[xhackerekx]

injectors , timming belt , coils also check for leak after maf sensor

 

[Project2G]

DIY Tune Up and Misfire Codes - Top 10 Misfire Causes

 

[rhodess89]

check out your egr valve sometimes those things can recirculate at the wrong time and thus a misfire happens. maybe even while it running wack it with something and listen to the ilde. does it change? Of course start for ground one on that code for sure but like i said egr valve go retarded somtimes.