[DeTomaso] Happy for 50 miles or so then not

[Robert Pink]

Would appreciate some thoughts.

When I first start my car and drive it runs great for 50 or 60 miles. At
3000 RPM cruising the air/fuel ratio is high 13 to 14. The vacuum is 18 to
20 and the car runs smooth.

After about 60 miles the air/fuel ratio drops to low 10, the vacuum drops
to 13 and the car vibrates and runs rough.  It appears to be missing and I
suspect the ignition system.

What is confusing is that if I stop for lunch or even after one night the
problem continues. But if  the car sits for a week or so it goes back to
running fine . The problem never occurs unless I drive 60 miles or so.

Thanks for your thoughts

Rob
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