Hey, I just started my project K5 about a week ago. I'm restoring my K5 that has sat in the driveway for about 2-3 years. The engine is a 350 TBI that ran strong when it was parked. I've drained and replaced the oil & oil filter, replaced the old gas with new fresh gas. The battery is new, and the cables are also new. The air filter is a clean K&N. Fuel filter was replaced about a year prior to it being parked for the extended period of time. O2 sensor was also replaced about the same time as the fuel filter. Now when its idleing its pretty rough. It will idle up and then back down to where it almost stalls, then back up again. It also stalls when i put it into gear, i have to keep the throttle up in order to move it, but even then its barely got enough power to move it. I have true dual exhaust but one cat is bad with a loud clank clank clank. I'm trying to get this running enough to a point where I can drive it a few miles to where I'll be rebuilding it. I'd rather not have to tow it, plus I'd like to get an idea how everything else is holding up. Any ideas why the engine is so rough?