OK, #1303 has been sitting for quite a while. I am just now starting to get it ready for the autocross season, so yesterday I fired it up for the 1st time in many months. It fired right off (with a jump start) & ran great for a about 10 minutes as I let it idle. Then, I went to move it & every time I gave it any more than say 20% throttle it would bog down & run rough. It kinda sounded like a 2 step set at 2000 RPM. If I backed out of the throttle slowly it would settle back to a normal idle. It was getting dark, so I just idled it back into the garage, shut it off & thought I would look into it more today. Well, this morning I go to try & start it (pretty cold out, 29-30 degrees), & it cranks over quite a bit, coughs a couple times during cranking, but won't fire. I try it again, only this time (& every time after) it won't even cough while cranking, but as soon as it stops cranking I get this LOUD backfire out the exhaust. The backfire actually happens AFTER the engine stops cranking. Any ideas guys? I took a quick look under the hood, but everything seems in place. Just thought I would post here before I start digging into the car with no real direction. Thanks in advance.