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I too have a new 75 Etec. Great motor. Hadf some rough running also at 1000 rpm's. I cleaned the plugs, added fresh gas and 2+4 conditioner. Motor runs great again. No missing at any rpm.
If you clean or replace your plugs be sure you align the plug just like you removed it, the open spark side must face the injector. Look at the plug the factory has marked it with a black marker (on the white ceramic) to aid in the alignment.
I own a 17DC and repowered this spring.
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