hitting the revlimiter

my cobra started to feel like it hits the rev limiter at 3500 rpm and the tach goes crazy and i hear the car sputtering but as soon as I let of the gas it stops .I changed the ignition coil ,TFI module even the distributor (i have the stock parts) and still have the same issue .This started after i moved my timing down a little because i was hearing piging it was at 14 degrees got it down to 12 then to ten with the same result .Any ideas what could be wrong the only thing i can think of is the spark plug wires the plugs were changed about 8000 miles ago with motorcraft stock replacements.
 
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Is the harmonic balancer in good shape? That's the only thing that I can think of. If you were adjusting the timing without getting the pinging to stop... that's what I would check.

I would say a bad tank of gas, but I don't think that accounts for the lack of power above a certain RPM, sounds like a timing issue.
 
Is the harmonic balancer in good shape? That's the only thing that I can think of. If you were adjusting the timing without getting the pinging to stop... that's what I would check.

I would say a bad tank of gas, but I don't think that accounts for the lack of power above a certain RPM, sounds like a timing issue.


I got the solid liquid filled harmonic balancer SFI certified I just bought new wires hopefully thats it because its definantly a timing issue its only happens when its over 3000 rpm. I'll keep you guys updated
 
Check the usual suspects: pull codes, check plugs & wires, cap & rotor, fuel pressure, vacuum leaks, TFI & PIP. Also, if you can, disconnect your MSD unit and use the stock ignition (if you mean it's like a 6A, 6AL, etc in your sig) since they have had a tendency to cause issues like these, and often require a good refurbishing from MSD.
 
Thanks for all the tips it ended up being the damm wires for the spark plugs I neglected them for so long I put almost 25,000 miles on them but since I rarely drive the car so I overlooked them I put ford 9mm wires on the old ones were the same just a different color .Two of the wires had spark marks on them which meant I was loosing spark in two cylinders . Thanks to all