NOTE: Because replacing an ignition module can be quite dangerous, this is a fix better left to an experienced mechanic.
Has your vehicle begun to sputter, stall, or be difficult to start? Have you tried all the usual fixes: checking the battery, checking the fuel line, adding a gas additive to rule out water in the fuel tank, and making sure the spark plugs aren't fouled?
If your vehicle is basically an around-town car, have you tried running it on the freeway for a while, just to blow out any carbon build-up in the engine? Any of these things can cause a reduction in the starting and overall performance of your vehicle.
If you've considered all of these possibilities and had no luck, it could be that your ignition module needs to be replaced. In case you aren't familiar with the ignition module, it is the intermediary device that, once you turn the key, transfers a signal from a sensor in the distributor to the ignition coil, which in turn makes the spark plugs fire. The ignition module could be in the distributor itself, on the outside of the distributor, or inside the compartment. Some modules also adjust timing.
When this component needs replacement, you'll have a variety of symptoms to let you know that it's time. Unfortunately, many of these symptoms are the same as for other engine or component problems, so you might need to do a little of your own automotive analysis to pinpoint this problem.
To proceed the steps, please see: http://www.dmv.org/how-to-guides/ignition.php
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