jeep spark collapse. Is it PCM or something else?

A 1996 Jeep Cherokee 6 cylinder. The condition is RPM decreases, which is caused by observable spark decay which coincides with RPM drop, then drops below minimum RPM, approaches stalll, then recovers. I checked CKS, replaced CPS, replaced coil. Tomorrow I will test TPS. What am I missing? The Manual says to take to dealer for PCM check. Any alternatives?

mdk68gto, ase certified m tech2010-11-06T21:37:17Z

Favorite Answer

i get the feeling that it is either the actual computer or the coil.

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iginio2010-11-07T03:31:28Z

Did u check your vacuum hoses?

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