Question about 1999 Chevrolet Silverado 1500

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The engine runs sluggish on my 99 silverado until it warms up, It starts and idols fine, but when I get going it runs sluggish at first

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Spark plugs are bad

Posted on Oct 07, 2010

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As to the 1990 Jeep YJ I asked about,engine is running, starts and idles fine. When you try to accelerate, acts sluggish until engine starts to warm up, then runs normal. Have changed the temp sensor.


Have you done a complete tune up ? To include replacing the fuel filter ? Are you the original owner of this Jeep ? If no, may have worn engine cylinders, piston rings, or bad valves. Many things could cause this problem.

Nov 18, 2016 | Jeep Cars & Trucks

1 Answer

Why is my 99 dodge intrepid steaming after warm up then cuts off til cool


Which engine, 2.7L?? Is it full of coolant?? If the water pump has failed, it a pretty expensive repair.

Aug 10, 2014 | 1999 Dodge Intrepid

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5.3L dont want to start when cold but once its warm it starts everytime


Have you checked the fuel pressure regulator to see if its leaking?

Jan 26, 2013 | 1999 Chevrolet Silverado 1500

1 Answer

I have a 2000 Chevy Silverado Z71 5.3 Liter engine. On cold starts and anytime it's sat for a while, I have to let the engine heat up or, more accurately what i presume is the catalytic converters need...


run the fault codes and check for problem ambient temp sensor, barometric sensor and MAF/VAF sensors
It is not getting the correct air/fuel ratio readings so it is running like a choke should be on but isn't

May 02, 2017 | 2000 Chevrolet Silverado

1 Answer

94 camry idols funny after it warms up


Have the EGR systen checked for the engine warms up good when cold and if the egr is not working the engines will run sluggish upon when warmed up

May 25, 2010 | Toyota Camry Cars & Trucks

1 Answer

Heater not working


That's because you can't just "run a little". It takes time for the coolant to warm up.

Dec 08, 2009 | 2006 Nissan Frontier

1 Answer

99 mercury cougar wont idol until car is warm p0420 codes came up


Hello, here is a thread I found on this site with from what it looks like, the same problem(with an added solution) that you have. http://www.fixya.com/cars/t1576683-1999_cougar_diagnostic_code_p0430_p0420

Jan 29, 2009 | 1999 Mercury Cougar

2 Answers

2000 silverado 4.8 v8 runs bad when it is cold out side.


Try replacing the coolant temperature sensor for the injection system.

Jan 05, 2009 | 2000 Chevrolet Silverado

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