Hi Mike,

Fuel Pressure Regulator. (or possibly a vacuum line that leads to it).
Running too rich would affect performance AND fuel consumption. Put a
pressure gauge on the fuel rail and verify that the pressure is within
spec.

Happy trails,

Greg Potts
1973/74/77/79 Westfakia "Bob the Tomato"
www.pottsfamily.ca/westfakia
Toronto, Canada

On Jun 4, 2006, at 12:33 AM, Mike Miller wrote:

> Vannuts,
>
> Driving back from a camping trip my new syncro ran well for 180 miles.
> 90
> degree heat, AC running and going about 65-70 down I 5 in California.
>
> As I was getting off the freeway for gas it suddenly started missing.
> Idle
> about 500 rpm, very difficult to get the revs up in any gear.
>
> Stopped for fuel [a bargain $2.99.9 a gallon] opened the engine cover
> to let
> it cool. Checked all the plug leads and looked for loose wires, etc.
>
> Filled up and it started right up and ran fine...until I tried to get
> back
> on the freeway. Same deal, missing heavily and would only hold about
> 45-50
> mph on level ground. Same in all gears, if anything worse in lower
> gears.
> Then it would catch and run smoothly for from 1 to about 30 seconds.
> Then
> the miss came back.
>
> Got home. Used 1/2 tank gas to go 49 miles.
>
> Any ideas?
>
> TIA
>
> Mike