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Re: 2003 Buick Century 3.1 liter V6
Make sure the idler motor is conected and wires are free and not stuck under the intake, and also check the pcv valve lines for proper routing, also check the line going to the vacium booster for brakes, and one of the ways to find vacium leaks is by aplying brake or carburetor cleaner to the suspected area and that will change rpm when leak found
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If coupling didn't fall of throttle linkage and if there's current past the CC switch, the vacuum hose fell off or you have a big problem starting to happen with intake manifold leak. Start engine, spray brake cleaner around intake gasket, if rpms speed up, you have bigger problems than CC but CC will show first. If no rpms increase and you have juice, replace CC unit.
I had an '87 Celica doing the same thing and it was an intake manifold gasket that wasn't sealing-pulling in a lot of air. A lot more than a vacuum hose leak, which would only raise the idle a bit, but not cause the surging you are having and that I had. So check for a large air or vacuum leak. A rip or hole in the large intake boot may also be the source. To check the manifold gasket, get a spray bottle filled with water and have someone keep the engine running at around 2000 rpm or higher. Soak the area all around the intake manifold gasket, wet it down pretty good. If any leaks are there, the water will get sucked in and cause a noticeable stumble in the engine, may even try to die. Check all hoses for vacuum leaks too, the large hose to the power brake booster. If it's not a vacuum leak, try unplugging the MAF sensor and see how the engine runs. If it settles down, clean or check the sensor.
First check for a vacuum leak.Check all vacuum hoses for cracks or burns then check for vacuum leak around the intake manifold could be a bad intake gasket.If there is no vacuum leaks then check your fuel pressure it should be 55-61 psi with the key on and engine off.If the fuel pressure is not within these specs then replace the pump.
Sounds like you have a vacuum leak. If you have the V-6 engine, those have a PCV hose under the upper intake plenum that likes to leak. You will need an upper intake gasket set, a new PCV Valve, and some PCV rated hose to fix it. DO NOT use regular vacuum hose on the PCV or you will be doing it again in about 6 months. Standard vacuum hose breaks down rapidly when it is exposed to engine oil.
Check all your other vacuum hoses first. Fix any leaks you find. If you don't find anything else leaking, then the hose under the plenum is your most likely suspect.
It sounds like a good size air leak somewhere in the intake system. Check all the vacuum lines for cracks or loose connections. Check for gasket leaks by spraying brake parts cleaner along the intake manifold mating surfaces and listen for an increase in engine rpm . Don't use carb cleaner for this, or you could end up with an engine fire.
If the check engine light is flashing this indicates that a cylinder or cylinders are misfiring.If the rpms are increasing you may have a vacuum leak causing the misfire. Would check for any disconnected vacuum lines or a possible plenum/upper intake gasket leaking. To do this you can spray induction cleaner around the upper plenum to check and see if the gasket may be leaking.
if this is a 318 they had a problem with blowing out the valley pan under the intake causing a large vacuum leak. it will also us oil because of this. you can run a vacuum test on it or remove the intake and replace the gasket