Guys, I'm very frustrated. I was so proud of myself for changing the wires and the spark plugs, but it did nothing to help my problem.

My service engine light comes on solid when I turn the car on. When I put it in drive is when it starts blinking. The worst part is when I start accelerating. Even the slightest bit will make it start shaking. The shaking does taper off a little bit as I gain speed. What could be the problem?