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The Cadillac Catera, while a beautiful car, suffers from listed "recall" issues regarding failed bearings in their DOHC timing belt tensioners. (There are two) The L81 V-6 engine designed (used in this car as a 3.0, and 3.2 liter offerings) suffered of this mostly because the valve to piston clearance is "crush" configuration so that when the belt slipped or broke, the engine was damaged. (Holes being punched through a piston or bending a valve, thereby cracking a head) They are a distributor less engine, so the problems you are having could be indicative of bad spark plugs or wires, fuel filter flow, (dirty fuel filter) or regrettably, a stretched or worn timing belt/ tensioners. It would be advisable for you to take it to the dealer to have them check to see if it was part of the recall, or to your local mechanic for repairs. Other issues like the failing of sensors or the computer modual are beyond the scope of a "Shade tree mechanic" so it isn't recommended that you attempt to make these repairs yourself.
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How do you adjust the idle in a 1998 Cadillac Catera?
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If the 1999 Cadillac Catera idles too fast, the cause could be a faulty idle stop solenoid. It may be damaged or it may have become loose. If it is idling rough or seems erratic, the problem could be a faulty EGR valve. Other problems could be a vacuum hose leak or a clogged PCV valve.
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