Stuck at 70...

["Dr. Faustus" <drfaustus@london.crosswinds.net>]

I noticed a problem with my Spitfire today, and was hoping someone could
send me it the right direction for a solution.

For some reason when I hit 4000 RPM in fourth gear (Approx. 70 MPH) I
cannot accelerate anymore.  The car acts as if it's not firing on all
pistons (Like my VWs gas cut off at redline).  I have tried to recreate
the problem in all other gears and at idle, but they all rev just fine.

Any ideas?

Andy L.
1970 Spitfire