I did have a thread in the xr topics, but was advised to move it hear.

it the mk4 1990 efi with iscv on the inlet manifold, i've fitted a recon engine, so swapped all the working parts from my old engine over, tps,iscv,map etc except crank sensor. The car cuts out when braking, and idles horrible, done ecu re-learn, base idle setting, checked for leaks with brake cleaner but no better.
if i disconnect tps, the revs pick up a little, but idles better, replaced it, still the same.
Also the emission are better with the tps disconnected.
Co-2.66
co2-10.00
o2-5.5
hc-0847

With tps disconnected.
co-1.45
co2-12.4
o2-2.69
hc- 0557