93 chevy engine lopes


Asked by Sep 22, 2014 at 02:53 PM about the Chevrolet Silverado 1500

Question type: Maintenance & Repair

93 chevy pickup 350 eng. lopes really bad, new plugs, wires, distributer cap and rotor button also changed fuel filter. Any suggestions?

5 Answers

John Carson

Define "lopes". What I think of when I hear "lopes" is a big cam at idle is a rough idle due to a big cam grind.


Yes lopes like an engine with a really big cam except this engine is bone stock. It is really bad at 5-10 mph, you can still feel it a little at highway speeds. I could record the sound and send to you if you have contact info I could send a video to.

John Carson

Check idle RPMs and timing. Your idle or timing may be retarding by the computer due to a bad air/fuel mix. If you can hook it up to a reading machine, see what the charts are telling you on the air/fuel mix. When was the fuel filters changed last? Have you had the fuel delivery system flushed out or worked on? Maybe the hot rod fairy dropped in a big cam over night?


It idles fine it only starts lopeing when you start off slowly. If you hit the gas hard from a stop you don't notice anything much until you level off at cruising speed. I changed the fuel filter a couple of months ago, have not had anything done to the fuel system/TBI.

1 out of 1 people think this is helpful.

My GMC 1993 truck(350 Engine) is fixed. Same symptoms as yours, would start, idle, and accelerate fine, but at any cruising speed it would lope or act like it was not firing on all 8. Turned out it was the EGR (exhaust gas recirculation) valve.

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