Code p174 &p304 help

[Svt then]

I'm new to forums and need help. Just bought 99 csvt and the car had some problems when I bought it like the imcr cable was broken and the check engine light was on. Bought new imcr from ford then had cel checked and I have a code p174 bank 2 lean and p304 #4 misfire. The thing is thow the misfire seems to come and go. I have also replaced the coil,plugs and plug wires ,fuel filter, and Pcv valve need help to find out what causing the problem. I also reset the cel light and seem to get acouple of good driveing days. ????

 

[crewchiefpro]

Leaking intake seals are a common problem if they are original. Misfire is interesting, does it idle high? Normally this code is for bad wires or plugs, but you replaced these. Try setting plug gap to no more than .040.

 

[Svt then]

No high idle and the spark plug gap is .54 and there autolite platinums. The car has 179000 on it. I was thinking a bad injector because it comes and goes

 

[Bostinolin]

More than likely you have a bad injector something is either caught inside or it's just done for. If possible switch the injector with one from the other side and clear the codes...if/when the light come back on see if it moved.