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Dear JJB,
Good p.m. If the overdrive relay has failed, you'll have difficulty getting past 50 mph. A dirty constant idle valve will make the car hard to start and at an extreme will cause very inconsistent engine operation.
If you have further questions about the doing of these things, keep posting. I, or someone else, will walk you through the process of fixing these things.
To do the constant idle air valve, you'll need basic socket tools (3/8 or 1/2 ratchet handle, a short extension, and metric sockets). Two hex head bolts (12 mm if I recall propertly) secure the valve. You'll need to loosen two hose clamps (requires a screwdriver), and one electrical connector (no tool needed).
The part of the IACV that you clean is the part at the other end from the electrical connector. You spray carburetor/choke cleaner (available at Wal-Mart or similar store). You'll see dark grey liquid running out. That's dirt being removed. Stop, when the part of the valve that moves, is clean. You can use a cotton swab, to accelerate the cleaning. Be Gentle!
The relay is a simple remove and replace. Any salvage yard should have one or two of these, for small $$$. If possible, go to a yard that let's you remove the item. That way you can pick a donor car with lower miles.
Hope this helps.
Yours faithfully,
spook
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