Bucking/misfire help

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Here's the deal. Above 3000 rpm, when I hit 5 psi, the entire car bucks. It feels like the car has full power, then nothing(like all fuel has been cut), then full power again and so on. Once I break 5 psi, there aren't any problems. The A/F ratio goes completely lean when it bucks. It's rich below and above 5 psi. It almost feels like hitting a rev limiter. If you have any ideas, please let me know!

 

Tim

[Redfox340]

Perhaps a Transmission Neutral Switch.

Explains the absolute Lean A/F mixture at 3K RPM's.

The ECM will kill out the fuel injectors to regulate engine speed.

Replace the switch and most likely you'll be set.

 

- Erik