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Originally Posted by aaron001au
hey all my old mans got a 99 WF festiva 1.5L
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when its cold it idles up and run but has a slight misfire once it warms up the idle fluxes up and down until it stall out
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Hi aaron001au, I had exactly the same problem with my '99 1.5L manual....
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we ended up putting a new coil, leads, plugs, dizzy cap and rotor button on it
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The old girl hadn't had a full service in a while, so my mechanic bro helped me replace all these, but idle was still jumping up and down. After poking around, he found that the hose going to the solenoid valve (purge control) had a hard-to-see split on the underside [see pic], and so was sucking air. I guess the split was getting progressively larger, hence why the problem was getting worse over time. A couple of bucks for a bit of quality hose later, and now she's running fine again! So, while I can't guarantee it's exactly the same with yours, maybe check that hose (and even the others too?) for splits. Hope this helps, cheers, Neil.