g1234

alright people after bit of help ive got my mates s1 with me at the moment it was off road for a while and got it out to rn this summer anyway went to had it set up and it was overfuiling and not revving right and popping and banging they tried saying the metering head was nackered but it came of my car i broke and worked purfect so i started to check a few hings timing plugs leads ect noticed when i pulled a lead off at a time it didnt really die as if it was running poor on all 4 so compretion tested it and got
pot 1 125
pot 2 125
pot 3 150
pot 4 125
so something dont seem right but the engine had a rebuild couple months before taken off road a year ago my mate sain it has not run right since rebuild so is it goin to be a strip out check all there work and c where they fucked up or am i missing something obvious to check