Question about 1999 Chevrolet Silverado 1500

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Idling rough chnaged plugs,wires,pcv valve, had 1 bad coil

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Is the check engine light on? Get the codes read for clues to your problem(s). If the engine has lots of miles maybe bad O2 sensor(s).

Posted on Jul 19, 2009

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1 Answer

Rough idle


Vacuum leak, dirty or clogged EGR valve, bad coil pack, bad wires, are a few things to check. I am assuming the plugs are okay. Good luck !

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Rough idle while in gear. There are no engine lights on. I replaced the spark plugs 6 months ago and seemed run better. Rough idle came back, so I cleaned out the PCV valve and it helped for the short...


Are your rpm's low when sitting at a stop light and vehicle warmed up? You could check your TPS (Throttle position sensor) or maybe your egr is plugging up, or one of your plugs or wires could have gone bad, maybe the coil on one of the wires is bad. You really need to plug a code reader into the ECU and see if there is a code being thrown. And NO, all codes will not cause the engine light to come on.

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Car idles fine when first started then starts to run rough. Also there is a delay when I push on the accelerator.


Check the coil and inginition module, they may be failing as the engine warms up. Also check you have the correct gap on the new spark plugs.
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Why does my 2000 ranger have a rough idle?


Thanks for choosing FixYa and welcome to the site. There are a few different things that can cause this rough idle to occur. Check your vacuum hoses for leaks. You could have a clogged air filter or fuel filter. If you haven't had a tune up in a long time, try to get it done. Change your spark plugs/coils, wires, distributor cap, coil pack. Check for any loose hoses or wires on the engine also. You might want to check your pcv valve as well. Anyone of these can cause this to happen so check then all out.

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My 04 f150 had a rough idle and would sometimes stall out. dealer said it was throttle body so I replaced. The idle is still rough but it it doesn't stall. Could it be a coil pack? if so do I need to...


I have a 2005 f150,with a 4.6 and it idles rough and when you turn on the ac it wants to die. Checked the codes and there are no codes.Any suggestions?

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My 2000 Ford Focus is still with a rough idling


Here are the things I would check.
-timing belt/pulley alignment -plug wires -coil(s) -clean throttle body

Feb 23, 2010 | 2000 Ford Focus

1 Answer

Check engine light comes on. p0171 and p0351 codes found


From Lusty Kid:

I know the economy is bad, but change all of the plugs. Check your PCV Valve hose, 150 rottens them out allowing air to be sucked in, thus all kinds of codes.

Depending on mileage. Dismount the EGR valve and clean passages. If you are really good dismount the throtle position sensor body and clean out passages with Choke Cleaner., dismount where the EGR valves connects to the engine, clean out passages. Also check the hose thats behind this mounting to ensure is not clogged. If clogged clean it out. If not replace it. Is about 1.5 ft. long, connects to the PCV Valve Hose.

When is the last time you change your harness. Can't remember??? Replace it. Good Luck

Nov 24, 2008 | 2004 Ford F150

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