I have a 1991 GMC Sonoma 4.3L that has 106K original miles and is
running really strange. It has a bad hesitation promblem around town
and going up a hill, forget about it. Now if I'm going along about 40
or 50 MPH and mash on the gas, it acts like it's not getting any gas
and actually looses power and speed, rapidly. Can anyone help me with
a possible direction before I take it to the shop. Please, thank you.