When i am just about to hit boost around 1 psi vaccum, my car starts to jerk/stumble and then it starts to pull, also if i flour it it jerks/stumbles more.

93civic
12:1 FMU
14b
6 psi
check valves
timing retard 2 degrees
94 octane

IS it better to use synthetic oil over regular?

 

i think it's your flour.

 

there is also semi synthetic

 

i had that problem when I was giving the car to much fuel

Nick

 

i think it's yo fuel to

 

stock fuel pump? Maybe its loosing PSI cuz the FMU is uping it to like 90+psi do u have a A/F guage?

 

yes i have an air fuel guage

 

i was thinking of ditching the FMU setup and gettting dsm injectors and an apexi afc, as there is more tunning available, IS this a good route to go?

 

FMU's stumble all the time, there's probably nothing you can do except change your fuel management.

 

Your car's toast. You might as well just sell it to me for $100 . Just kidding. Yeah definatly too much fuel. Are your injectors stock?