srgnt pepper

i have an 88, 2wd comanche and when i try to start it the engine turns but doesn't start, though sometimes it will. any ideas on what the problem is?!

i have an inline 6, '88, two wheel drive with stock suspension. sometimes when i hit bumps, no matter how big or fast, that side will start wobbling and shaking REALLY bad. it stops if i hit the brakes. any ideas what the problem is or could be?