Acceleration

I bought a 2003 crown vic. With interceptor. I just replaced timing chains and drove the car it ran good I didn't kick it in then. I washed the motor and now when I kick it in it shakes and the check engine light comes on. First thing I did was blow air to all the connectors I coulf find then I took it to advance they hooked up the scanner but it gave no codes. If I drive it normally everything runs good and no check engine light.