help with 1986 325es won't start

My 1986 325es won't start. I will crank but won't idle. We regasketed the motor about 6 months ago and since we put it back in we have gotten a new battery, alt.,starter,idle control modular,computer,(both the computer and the idle control were used parts). We are at a loss for what to do next. We have spark, fuel,pressure,and no other ideas. If anyone can help that would be great thanks

Try spraying starting fluid in the throttle body and why did you decide to replace the DME and idle contol module? Try using the old components.I would check the crank sensors in the bell housing. Do you have a Bentley Repair Manual? I would also like to know how/if you were able to change the front crank seal. Mine is leaking.