93 Silverado Skips at High Speeds

chevrolet
1500

#1

I have a '93 Silverado 4x4 with a manual transmission that occasionally skips at high speeds after driving for 2 or 3 hours. It does not skip at high speeds (> 60 mph) until after driving for a few hours, and then the engine seems to skip once every minute to minute and half. Any thoughts? A friend suggested that it might be electronic advance problem.


#2

How many miles on your car? Has all the recommended maintenance been done?


#3

It has 168,000 miles one it, but only 10,000 on the engine. yes the recommended maintenance has been taken care of.


#4

If you have a tach did you notice if the rpm goes up or down?