My 73 starts to spit & stutter when going over 50 mph, it almost shuts down and backfires a litte. Runs fine under 50 mph. Help?

slackbo
0

Asked by Dec 09, 2006 at 02:04 PM about the 1973 Chevrolet Corvette

Question type: Maintenance & Repair

I just bought this car. I got on the freeway and it started to spit & stutter, and just stopped running. I would pull over and it would start right up and as soon as I hit abput 50 mph the same thing. I changed the fuel filter which was old & dirty, and the air filter which was the same. Sprayed the carb with carb cleaner & tried it again. It runs great under 50 mph but doesn't want to keep running past that.
Thanks in advance.

4 Answers

lightGear
28,675

The most common reason for sputtering or backfiring is spark plug wires shorting out, electrical wire shorting out, or water in the fuel tank. http://ezinearticles.com/?Does-Your-Car-Engine-Backfire?&id=2855 That webpage should help you in trying to diagnose the problem.

CBW
0

This could well be your fuel pump. If the pump is starting to fail, it will not deliver enout fuel at sustained higher speeds - and the car behaves as if out of gas (the engine is effectively running out of gas) - but runs normally otherwise. The fuel pump's performance can be evaluated by measuring its output/time - but you'll have to locate the acceptable spec.

Anonymous
0

did u change filter in carb try that big joe from pitts

Anonymous
0

fuel pump or filter by carb or maybe carb float level to low or bad coil

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