Hi guys new to forum need help please

Hi guys new to forum need help please

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Hi guys i own a 2003 mg zr 1.4 i purchased the car with a blown headgasket oil and coolant had mixed, recently replaced headgasket, bolts, cambelt, water pump, thermostat and thoroughly flushed all waterways, upon starting the car after rebuild its chugging/rough running at idle, eml is on and when plugged in got code p0170 fuel trim bank 1, i havean identical zr with i used to test parts,ive tried tps,cps,map sensor,iacv,new lambda sensor, all to no sucess, while running live data on 02 sensor it states lean to rich switch time is out of range and shows that the pre cat sensor is flatlining at 0v and post cat is at 0.5v when pre cat is unplugged it is constant at 0.5 , ive checked for air leaks around manifold and throttle body again to o success ive also testing compression all within range at 200psi, any help is greatly appreciated as im at a complete loss now, many thanks in advance for any replies

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Hi guys new to forum need help please