Hi folks I’m after some advice. I have a 1.8VVC fitted with a 48mm alloy TB & aftermarket air filter. I have recently done a full service, fuel filter & cambelt change. Car starts fine, warms up correctly & drives good, problem I have is at idle after warm up I get a surge now & again up to about 2K & if left longer the idle becomes rough & stalls. I have another VVC & have swapped the IACV & reset it & also the TPS & it’s still the same. Any advice would be welcome, thanks. 

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