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I assume you replaced the rubber bushings that fit on the injectors?
It sounds to me like the initial problem you had was due to not enough fuel reaching the injectors. After replacing injectors a bit of a life hack is to use a jumper cable on the fuel pump relay to get the fuel to circulate around the system before staring.
(Warning:- you should be careful with this because you might be filling the inlet manifold with fuel if run for too long - the other non jumper lead way is to flick the ignition switch several times to get the fuel pumps to prime)
The problem that you are now having sounds to me more like air leak related. Check - check - and double check all of the rubber pipe fittings near and around the injectors. If some of the connections seem loose a quick botch is to wrap self amalgamating tape around the rubber pipes to try and seal them. (This is a crappy long term fix - ideally you should replace rubber tubing with new if you know they leak - but it works well as a diagnostic "tool")
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