UK Car Repair Questions? Ask a Mechanic for Answers ASAP
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Please check for any malfunction codes .if the timing is off we will see misfire codes cam / crank codes etc.
Get back to me with any codes if found .
Make . model and engine please and how many miles on the engine .
Why was the head gasket replaced what problem was you having .
Sounds like an intake manifold leak most likely coming from the brake booster check the vacuum line from intake to brake booster .
Then check all vacuum lines and intake manifold gasket for leaks .
check this then pleas eget back to me .
Do a head gasket test you may have a bad gasket .
Who did the repair dealer or service centre.
When you torqued the head how did you do it .
This is a very tricky issue .
Headgasket test by checking Co2 in the coolant .
Do a engine compression test and give me the readings for each cylinder .