It was water in the fuel we assumed cause the engineer didnt find any other faults so they drained the tanks and lines and cleaned it up.A few days later a 152 in our fleet had the same problem but the RPM just didnt drop as much thats all. Im not gonna mention the company but the reason for me moving on was be cause the maintenance was shocking and 100 hrlys were done by airtime and students were still charged by VDO...DODGY I dont think I gave anything away here because that could of been any flight school in YSBK LOLLOL :P Oh yeah Owen the fuel came good after a few minutes of tank swapping and fuel pump pressure but I did have a paddok ready from the corner of my eye...