Hello Guys... I've been reading a lot on this site in order to enjoy my newish 90 SC a bit better, but... I just replaced the wires and plugs, plus PCV, and it still bogs down between 2,800 and 3,300 to the point that I then back off and shift. The cars history is its from California, hasn't had tags on it since 1998. It shows 76,500 miles, and by the looks of the body and interior, as well as the engine bay, that is actual mileage. It sat so long that when I drove it home to Arizona from Mira Loma, that I didn't think I was going to make the last 50 miles (the fuel filter just about imploded on itself). Easy and slow got me home where I changed the fuel filter and it then would run, just not over 2,500 rpm then. I have noticed that when its cold, it will accellerate to 3,000 with no problem, then begin to bog. As it get hotter, it then starts to bog down between 2,500 to 3,000 and really won't run over 2,800. As its a 5 speed, shifting gets me along but i would really like to feel the whole potential of this motor. The oil pressure is good, it doesn't overheat, it just doesn't run out well. Noticed that the plugs looked like they were a rusty color, all of them. As far as the rusty color of the plugs, I thought they may be the result of the prior owner using an octane booster and then the car just sitting still for years. There don't seem to be any vacuum leaks, at least not what I can find. I'm thinking that either the cats are clogged or the coil doesn't deliver when it gets hot. Now I'm interested in your thoughts. I'm willing to try anything you suggest as I intend to keep this car for 5 to 10 years and learn as much as I can about it. I really enjoy driving it. I also bought the last right hand rear electronic shock (motocraft) that Rock Auto had and am looking for another one for the left side (they seem to be A & B - B is the right side). All your thoughts will be greatly appreciated. My prior wrenching experience with cars was racing a Toyota Corolla SCCA ITC car in Phoenix in 2004 where I enjoyed winning eight races in a row and the road race championship in my class. Then again, that was a simple toyota, not an SC. Looking forward to hearing from you.