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Check engine light flashing means there is a bad misfire , it flashes to tell you your damaging your catalytic converter . You need to have it check , you don't won't to have to replace the catalytic converter . Can cost up to $1,000.00 . Flashing Check Engine Light CarMD
Not likely.... But as you just put fuel injector in make sure your fuel cap is tight cause if its not the computer will detect a evaporation leak in the gas tank. So tighten the gas cap and drive the car for a few days & see if the engine light goes off .. If not get the computer scanner to see what's going on
The most common overheating problem with the Northstar engine is a blocked purge line(small hose).The purge line is designed to purge air out of the cooling system. There is a small diameter hose coming from near the top of the coolant tank (not the cap) ,this is the purge line. With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating. If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage. The hose goes in to the engine to a crossover and comes out the other side close to the thermostat housing,the blockage may be there.
First item that I would check is the idle control valve. you can increase the idle speed of your engine if it runs below normal. Since you get a check engine light, I would suggest to get the error code.