Often the pintles just get stuck shut and the windings can't pop them loose, and with no flow going through cleaner won't help. What you need to do is gently push in the pin at the bottom of the injector with something small. It doesn't push far, and you don't want to push too hard (bend or distort it and it's junk, probably). As soon as it pops loose then run some gas through it.

If I let my 1800 sit around without running for a couple of months a couple of injectors will stick, a couple of minutes popping the fuel rail off (just uncrew the holders and pull it back, all wires and hoses attached), pushing them in, and replacing and it runs perfectly.
--
I'm JohnMc, and I approved this message.