1990 AUDI 80

This car idles and runs great when there is cooler weather or it is raining. When it is hot and dry it idles very bad. It ran great all winter but during 80+ degrees and dry it has very unstable idle. Why
does it run good with cooler wet weather?
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PSH wrote:

Bad ignition wires would be my first guess.
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Jim, Sounds like the opposite - bad wires usually short out when wet. Sounds more like vapour lock in the fuel system - are all of the heat shields in place around the injector hoses? Maybe check at www.humanspeakers.com/audi to see if Huw has a solution. Cheers! Steve Sears 1987 Audi 5kTQ 1980 Audi 5k 1962 and '64 Auto Union DKW Junior deLuxes (SPAM Blocker NOTE: Remove SHOES to reply)

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