Ive had the P0301come back a couple times now. First changed the spark plugs. Now I changed the coil packs. I don't want to end up throwing parts at it. I bought a scanner and was trying to look at other things that might point me in the right direction. Vacuum is 18-21 at idle. It drops down on acceleration and if I really hit it the boost is about 9-12 psi. I ordered a new fuel injector for cylinder 1 only, just so I don't end up building a new car. I'll replace all the fuel injectors after Im running but for now I really just want to find the issue and resolve it. Any help is appreciated.