98 GT starting/acceleration problem
I bought my dad's 98 GT from him a few years ago and I'm starting to realize he didn't do much regular maintenance on it besides oil changes. For years it's taken it two tries to start up 90% of the time. A few days ago I decided to start giving it a tune up, so I changed the spark plugs (which were shot to hell. I asked and he never replaced them). I also changed the valve cover gaskets because they were leaking. After doing this, it's been having more trouble starting and I'm not getting enough power when I accelerate. When I'm getting on it, it gets to a point where I can't get any more power. I'll keep pushing the accelerator and the rpms stay the same and it bucks slightly. This problem comes and goes randomly. I can't find any correlation with the weather. It also happened once before I started working on it. I put some seafoam in the tank and filled it with premium. It fixed the problem but now it's back. I've heard it could be my fuel filter, MAF sensor, fuel pump, etc. Anyone know where I should start? New wires and coil pack is next on the list, but I'd rather fix this first.