So my daughters 99 DOHC throws misfire codes, mostly happens at higher speeds. I've done the plugs, wires, cam sensor, crank sensor, coil, did a major PM a year and a half ago, took the intake off, had the injectors rehabed (Injector Rehab.com nice job with before and after charts), fuel rail looked clean, rinsed and blown out. What's left? PCM?

 

What are the codes?

 

p0303,p0302,p0301, Random misfires

 

You are getting Mis-fire pretty much at all cylinder?
maybe it jumped time? you got ur Timing belt done yet?

 

have checked the belt, all is inorder

 

your timing might still b off thts the only thing i can think off are all the point matching up?

 

As I don't have 100% asurity on that Next time I get the car I'll triple check

 

I see this is an older post are you still having this issue?