Mazda RX-7
Nissan 300ZX
Nissan Sentra

A 1987 non turbo RX-7 has a hesitation around 4000rpm.What could the problem be?



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The dreaded 3800 RPM hesitation is cause 90% of the time by poor ground connections between the engine, the battery, and the car. Clean or replace all the under hood ground connections. If there is still a problem after that, look at cleaning the fuel injectors and (on a N/A) that your 5th/6th ports are operating correctly.