Hey, any help is appreciated.  I recently blew my head gasket at only 75K.
The temp gauge was hitting high and exhaust elements were detected in the
radiator.  Its been 2 months since the head gasket has been changed and
recently the car started studdering and surging at high speeds on the
freeway.  It seems to occur at about 1500 rpm.  When coasting, the
techometer  sometimes jumps up and down, like the engine is studdering. At
low speeds, on acceleration, sometimes it cuts out for just a sec but goes
without a problem.  I have changed gas to no avail. I took it in and the
throddle body was cleaned and the fuel injectors cleaned. No help. The
mechanics don't know what to think. Anybody got any clues.  No lights have
come on to hint.  
thanks much.