'95 Eclipse bucks and sputters under load.

1995 Eclipse, non turbo, seems to run fine when sitting and just revving the motor but sputters and shakes when you take off. The more throttle you give it the worst it gets. Replaced coil pack, wires and plugs but that did not help. Any suggestions would be greatly appreciated.

Did you gap the plugs to spec.

Yes, plugs were gapped properly. Problem actually started after shop put on new coil pack because of slight hesitation. Put old coil pack back on but the new problem still exists. Maybe that a vacuum hose or something got knocked loose during the change but I have been unable to find anything. Would a loose timing belt cause this type of problem?

Check engine light is now on. Error code P0352, Primary or Secondary Circuit Malfunction. Does anyone know what that means?