stalling
 

I bought a 87 turbo II and had it for about a little over a year. I then bought a JSPEC motor with 30,000-60,000 miles on it. I took off some of the emissions and proceeded to do some block offs. I put the motor in and it starts up but then idles about 2000 RPM's then like 15-20 seconds later stalls out. I cleaned my MAF sensor, changed my fuel pump, bought new spark plug wires, and checked my vacuum hoses for any leaks. The motor still stalls out. I been racking my brain over this can anyone give me advise. Thank you?