Mechanics

BUICK REGAL AIR FILTER PROBLEM

1989 Buick Regal

Why is my 1989 Buick Regal keep dropping in speed when I drive it, I have changed the fuel pump and filter a couple months ago and it ran fine, now a couple months later its missing real bad, so I changed plugs and plug wires and air filter and put fuel injector in it and now when I drive it, it hits a certain speed and stays there or it drops down, it also goes really slow up hills. Please let me know what anyone thinks might be wrong with it. Thank you
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Sugar1059
November 7, 2012.



Check the back pressure on the cat converter. It may be clogged

Roy