Sorry for rezzing an old post but Im having a similar problem. Just got the oil changed yesterday, drove 50 miles to school as i turned the corner on to my apartments road it bogged down then continued on fine, I stopped shut it off took my stuff inside (maybe 20 minutes) came out to go get some grub, wouldn't start...I cranked it over and gave it gas and got a plume of blueish/white smoke, now its cranking over and wanting to start but doesn't catch. Ive checked the oil it looked low so I added a quart now its over full i believe, clear good oil not muddy or murky.
Today Ive replaced the fuel filter, pulled my plugs, they appeared to be oil fouled pretty bad so I plan to replace those tomorrow.
Im getting spark from the front 3 cylinders as Ive tested them all I haven't messed with the back 3 yet. If i let it sit for a good while I almost catches and starts. Can I get some help please? lol Im stuck 50 miles from home and running out of ideas lol