Okay so I replace the timing chain on my 4.6 liter 2 valve what's running good for about 2 weeks then I got a p0171 and p0174 trouble code in the process of trying to fix those two now I have a misfire number 4 and a misfire and number 7 cylinders ....check coil packs they have spark check injectors those where fine...... plugs were wet... pull the valve covers truck make sure I didn't have a. Bent valve don't ..know where to go from there everything looks fine. Gone through and check the fuel pressure check 4 fuel leak down make sure that the injectors weren't stuck open it idles rough but when you give it when I give it throttle it it goes away

 

The 71 and 74 codes are typically caused by vacuum leak in the intake system. Could be you split a vacuum hose or a PCV hose.

You talked about the first codes, but is it giving codes now? Not clear what you're trying to fix. Old problem or new problem?

 

Ok the first codes where the 71 and 74 code. Now inaddition to those I have a p0304 and p0307 truck missing shaking really bad.... Like I said I check spark .I check fuel... I have a scanner but still new to using it

 

And give gone over the entire motor looking for vaccum leaks using propane,starting fluid every thing

 

Hold the gas pedal to the floor and turn it over. If it works, it won't start. The PCM is supposed to cut fuel when cranking at WOT. Anyway, listen to the motor as the starter spins it. Does it sound like one or more of the cylinders isn't making as much compression as the others?

 

I would try to fix the misfires first. What do the plugs look like in those cylinders and how old are they? What brand plugs and coils were used?

 

plugs are brand new motocrafts coils are msd. Swap them from different cylinder still same two 4 and 7 miss fire......

 

Might be leaking injector seals, the seal to the manifold. You probably pulled the injectors and rail to do the work? That would give you a vacuum leak, causing more fuel for all of the cylinders and the 71/74 codes. The extra fuel to make up for the vacuum leak would cause other cylinders to be rich and foul. Could also be manifold seals. Or PCV hoses.

Misfires are usually a secondary effect of some other problem. Lots of coils get replaced for the wrong reason.

If your scanner does live data it would be worthwhile to look at fuel trims, cold and hot, to see what they're doing. Vacuum leaks are generally worse when cold. Your freeze frame data will also show conditions when the codes were set.

If you didn't have any of these codes before you did the timing gear work then your work probably caused the problem.

 

Ok injector o rings are new along with....

 

Ok tried the WOT. Start up trick started.......