Question about 2004 Chevrolet Tahoe

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99 siverado 4.3 slight chug or buck under load eng lite flashes t

Have done cap,rotor ,wires and plugs and fuel filter, fuel pressure checks ok but may be delivery problem.After three drive cycles lite goes out but IT WILL be on again the next day.

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I suggest having the codes read which is usually done for free at part store. It may be a Throttle Position Sensor.

Posted on Jul 01, 2009


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Hard cold start for 99 intrepd w2.7l/ ok hot/set check eng lite

Check your Fuel Filter, especially if your in a cold climate that has already reached freezing temps. If you have any moisture in your fuel system and the freezing temps have arrived the filter and injectors can freeze up slightly causing this type of problem. If this was happening in warmer temperatures check the fuel system for pin hole leaks that could be allowing the air into the system.

Nov 23, 2011 | 1999 Dodge Intrepid

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I have 1995 chev 1500 350 cid, I have changed fuel filter, plugg's, wire's, rotor, dist cap. Yet under load it buck's, and when up to speed run's great. What am I missing?

check EGR or PVC valve operating correctly. fuel pressure or volume, replace fuel filter, possible air leak into manifold vacuum, check vacuum lines not leaking, incorrect spark advance

Oct 16, 2011 | 1995 Chevrolet K1500

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My 99 blazer 2wd has a random multiple missfires...replaced plugs wires dist. cap and rotor button. it only does it when trying to keep speed, and not under acceleration...y?

Could be plugged fuel filter, faulty fuel pressure regulator (check your pressure) and most probable is a sticky or dirty injector. Do check your timing as well.

Feb 17, 2010 | 1999 Chevrolet Blazer

1 Answer

My truck hesitates and chugs than will clare up

There are several ways about this. Could be fuel filter, water in fuel, ignition part starting to fail(plug, wire, cap, rotor, coil) or possibly even oxygen sensor. The oxygen sensor will clear up if you accelerate heavily then when under normal load it will start chugging again. These are a couple of areas to check without getting into serious diagnostics.

Oct 12, 2009 | 1987 Ford Bronco II

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7.5l MFI/SFI timing (?) problems

Hi, you describe a chugging even on moderate hills, is your transmission shifting properly? It sounds like it's stuck in overdrive. Or a plugged injector or two that maybe push out fuel OK in warm up mode but not after. So if your transmission is downshifting when is should and you still have no power, I would have the injectors checked out. Good luck, chuckb

Apr 06, 2009 | 1994 Ford F250 Supercab

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99 olds alero 2.4

I'm sure you have installed a fuel pressure gauge and monitored the fuel pressure while the problem is occurring?Another diagnostic tool which is easy to do,is while the problem is occurring,unplug one sensor at a time beginning with the Mass Air Flow first,.if it uses one.Many times,not always,depending on the sensor,if the sensor is taken out of the picture as far as what the PCM is seeing,like unplugging the MAF,the PCM will substitute the missing sensor output with a generic value that will allow the engine to at least run,and if unplugging for example the MAF,the engine idle speed returns to normal,you know you're onto the problem.You didn't mention if the engine ran ok other than the idle problem.As far as checking for vacuum leaks,i use something like brake cleaner or WD 40,more of a liquid,and it does sound like a vacuum leak.Plastic intake manifolds do develop nearly invisible cracks that open up more with heat.Revsisit the possibility.And as for the PCM,it is possible,but more likely a mechanical problem.Lastly,remove an O2 sensor or two before the catalytic convertor,run the engine and see if anything changes.Cheap way to verify the catalytic convertor is flowing and not restricting engine airflow,as i have seen bad cats cause misfire codes and strange problems.Good luck.

Dec 03, 2008 | 1999 Oldsmobile Alero

1 Answer

Chugs/dogs when hitting approx 40-45 mph

timming belt or a cloged cat. good luck you can drill a hole in the pipe before the cat to test.......

Oct 01, 2008 | 1984 Subaru Gl

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