Second time shooting-problems big time

First off yes I read the ignition problems thread on the 2nd page, mine seem to be different. Ok first shot went off no problem, but hit about a foot low and 8 inches to the right. Figured I might have flinched. So I reloaded for a second shot, and thus started the fun. Misfire after misfire . Most times all the pan powder would light, a couple times there was no spark. Cleaning the pan, frizzen and flint seemed to not help. Every shot was at least 2 or 3 misfires. Before every shot I made sure the flash hole was clear and the pan was wiped. Worse yet the accuracy was horrible until I had 3 or 4 shots under my belt. I wanted to experiment with different loads but couldnt get the gun to fire reliably enough. I tried everything, a little pan powder, pan half fill. Nothing seemed to work. Most misfires were the pan powder going off with no firing of the gun. I ran a patch down the barrel a couple of times and it seemed to help slightly, a quick follow up shot wasnt possible. Is it normal for a gun to shoot better dirty? I'm using .490 roundballs with .015 patches. Also I ran an oiled patch down the barrel last time I cleaned it, then before I shot I ran some clean patches down the barrel- I assume the accuracy problems were due to too much oil in the barrel. Might head up to Dixons today to talk to them