I swapped a ca18det into my 240sx and ran into this problem. it can be three main things.
it easier to txt and tell you you or feel free to call me at 9095282710
but having said that. always start
by checking the fuel pressure. the stock 240sx will not support a ca18det (this is from personal expreience) my stock fuel pump fell short, a ca18det has larger injectors than a ka24d(e) i bought a walbro
second, the ca18 has butterfly valves bottom half of the intake manifold. make sure the vaccum line is running correctly. if the butterfly valve isnt opening, itll cause this exact propblem
again feel free to call or txt if needed
9095282710
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