There could be several reasons why your 1990 Ford Capri 1600i won't idle. Common issues include a dirty or faulty idle air control valve, vacuum leaks in the intake system, or problems with the fuel delivery, such as a clogged fuel filter or failing fuel pump. Additionally, issues with the ignition system, like worn spark plugs or a faulty ignition coil, could also affect idle stability. A thorough diagnostic check is recommended to pinpoint the exact problem.
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