autograss k11 micra class 1 jnr starting issues

[sam jackson]

i have a 998 k11 autograss micra that refuses to start its had a non nats ecu and matching loom ,fuel pump is wired separate as is rad fan. the car seem labored when turning over a fires up but will not run and as it seems like its just about to run it appears to nip up or as the timing is wrong or even if it hydroliking ( bad spelling but you get my drift). any ideas what is causing this please