Bucking Bronco (was: HELLLLLP! Sudden odd symptom)

[Scalmanini Steve]

The fuel filter was replaced 6K miles ago in the
180K tuneup and since the engine ran at 3-4K rpm
when the problem first occurred Thursday I figure
it's something else.

Yesterday I replaced the O2 sensor, rotor & cap,
and checked the plug & coil wires.  Afterward it
ran better (idles smoothly, accelerates under load
OK if done slowly, doesn't die when I let off the
accelerator although drops sometimes to ~ 400 rpm)
but if I try to accelerate normally under load,
or any faster, whoa!  Immediately coughs, chokes,
misses, sputters, and then, after maybe 2 seconds,
starts bucking so hard that I don't dare let it
continue.

Today I plan to finally make a code display lamp
and read them for the first time (' never had to
before in the 8 years I've owned it) since the
check-engine lamp is on constantly now.  And
check the plugs (never heard of one dying, but
one dead cylinder might cause this).

Thanks for the suggestion,

Steve

------------------------------------------------------

Did you think of the fuel filter? Might be plugged.

Rich




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