Technical Fiat Bravo HGT hard start

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Technical Fiat Bravo HGT hard start

Joined
Nov 19, 2016
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Hello guys I need some help with a problem which maybe someone has had previously. So my Fiat when cold starts perfectly, but after 30 seconds the rpm will drop down to 500 for 2-3 seconds and then go back to 1200 and when the engine is warm it cranks a lot and barely starts like it's choking itself. I don't have any error codes and I've replaced the crankshaft sensor, temperature sensor.
 
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