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i belive thet you don't have prasuure(fuel) right for the engine warm up.
When you start the car the fifth injector works and give +fuel
When it warm up probably the warm up regulator close the fuel(pressure) and you have a lean mixture(for running)
Look the warm up regulator,on the bigger bolt you have a sort of filter,usuly it is opstrukted after 30 years.
Did you change the fuel filter-can be the same problem.
The fuel acumulator or the line is opstructed?Fuel pump?
-maybe the fue pump is not for CIS-if you have a STD injection fuel pump it pump 3,0 cca BAR.The CIS pump have minimum 5,0 bar.
Try.Good luck.
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porsche 924 carrera gt 90% ready
porsche 944 NA 86' half 951
951 full project for 944
chrysler 300M
6 x 924 and 944 canibalized or death
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