misfire on idle - 2004 zs td 104

Hi all



seemed ever so slightly down on power this evening driving home from work. Get home and i have a pupupupupupu coming from the exhaust on idle. i have he egr unplugged, msf unplugged and paperclip across the terminals. Thinking about it its been on and off like thia for a while..



My first thought is, injector going?

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