1999 Chevy Silverrado, 5.3 Z71. Stalling out when warmed up going up hill. Took it to Chevy certified repair man said it was Catalist converters. Had those repaced, drove it for a week then same stalling problem happened again.

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probably your wiper motor is going bad but it could be your wiper switch on colum

Has the check engine light come on at all ?

The 02 sensor is detecting a malfunction in the emissions. That would be from a bad fuel mixture, too rich or too lean caused by dirty or faulty injectors or MAF sensor. A clogged catalytic converter will also cause it. Connect a manual fuel gauge to the fuel rail and test your fuel presuure. Test your fuel pressure regulator, the fuel pressure should increase 5-10 pounds when you disconnect the regulator...if it don't, the regulator is bad...Check for vacuum leaks and stuck or dirty egr valve. This would cause a lean condition. Check your air filter. Good luck, i hope this helps.

micheal crawl under the truck on the driver side with a 5/8 and a 15 mm wrench and a small cresent and crack one end of the line lose going to the fuel filter crank the engine to see if it dribbles gas? or sprays its just a litte comes out your fuely fliter maybe clogged but when you take the line lose from the rear of the fuel filter and little gas comes out? then you can bet!! the fuel pump is gone

my 99 z71 transmission lost drive and over drive. what could be the problem?

there's more than 1 and they are all inside the pan and in the valvebody be careful messing with this stuff it could become very costly very fast. good luck

Check the Alternator, Mine was doing something similar to it, was almost dieing constantly, at stops in drive, lights would flicker alot on bumps and up hills when rpm's would increase. Also yea mine also got worse after it warmed up, I replaced the alt. with a reman. but unless it was professionally rebuilt by a local electrical shop (which are kind of rare now a days) I would just get a new one from a local parts house, Also you pay for what you get. Do not have the shop get the part for you because they have anywhere from a 10%-25% mark up on local parts houses which is close or above what you would pay

im not sure of the color wires that should be powered but have you checked the fuel pump relay under the hood? also check that you have a good ground at the pump dont check just the positive voltage check for negative (ground) also

if one is bad chances are both of them will be bad. they would be the same age so your best bet is to change out both of them