We have a Vauxhal Astra 1.6 on a r reg with a constant miss fire, we have sent injetor fluid through, changed plugs ,leads, and coil pack ,petrol filter and now at wits end the enginemanagement light is off any ideas
i would do a compression test this will show if you have a sticky valve,cracked piston ring etc if all this is ok check the fuel pressure as the pump or regulator could be faulty also check crank sensor(heat damage to cable!)good luck
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