Today, I installed new NGK spark plugs and Magnacor wires on my automatic Limited Roaster. I was able to change all 12 out fairly easy and to gap and torque specifications. After completing the installation, I gave the engine a quick rinse, let her dry and took her for a few test drives. No problems as all, I noticed improved performance. Well, roughly 3 hours later, I went for another drive, no problems until I stopped at the first stop sign. When I tired to accelerate, I went at a dead slow pace! After about 10 seconds I stared to accelerate at normals speeds, but every time I stop it will do the same thing. The check engine light illuminated so first thing tomorrow I will have that read. It takes 5 seconds to rev the engine to 2000 rpm at park.. WTF!! I dont know what went wrong.. any ideas? I dont think its limp mode because im able to run through all the gears.. it just takes forever! Thanks in advance.

Chris