Car stays running after i turn ignition off and heatsoaking

[LeD ippen]

I just finished my swap laborday weekend. the car has been running fine but now it stays running for a couple of second then die out, when i turn the ignition off. the gauge goes off partially and my fans go off, which are wired to wiper switched power.

2.5in turbo elbow to 3 in downpipe all the way back
comb filter
stock ecu
hks GT2510
mishimoto rad
cold pipe across radiator
new oem water pump and nismo thermo
bcpr6es gapped .8mm

also everything in the enginebay is extremely hot then cant even touch. the front end is a stock chuki bumper which dont help.
Any advice from veterans really appreciated

[Carl H]

sounds like its dieseling...you need to check your base timing.
also tagging power from the wipers is a bad idea, that power circuit is not designed for the load the fan will put on it.
wire in a dedicated relay for the fans and trigger via the fuel pump trigger if you want to have the fans operate with key on.