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I have a 94 Cobra. It boggs at and above 4500 rpm. This happens whether or not I accelerate fast through the rpm's or slow. I have replaced plugs, wires, cap, rotor, ignition coil, mass air, tps, cps, fuel pump, and fuel filter. If you have any ideas please let me know. I am getting beat. Alot.:( :mad:
 

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Reset the timing yet? Make sure your balancer is not wobbly, and then reset the timing to 10* Then bump it up in 2* incraments until it feels and sounds right. DON'T PING!

Also remember to unplug the spout connector when setting the timing and replace it afterward. I say this because this is your first post and I don't know how familiar you are with working on the Cobra. Good Luck!:)
 

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Could be clogged cats?
Distributor not advancing. Put a timing light and make sure it goes up when the engine is reved. Spout could be unplugged.
Just some thoughts.
 

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my damn car pings at 10* 87,89, or 91 octane
 
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