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New Coil now it runs really rough- '89 240 200

I was having a rough running/stumble that disappeared after installing a new coil.

That was a couple days ago.

50 miles later the car is running worse than ever.

Starts and idles great but hit the gas and it starts backfiring, stumbling, and eventually surging. If I floor it the engine smoothes out after a couple seconds and runs strong while at high RPMs.

So I put the old coil in and it runs much smoother!

New plugs, wires, cap, rotor.

Any ideas?






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