DIS or CPS problems? At wits end with a no start

[mrcow32]

95 MTX--last week it suddenly went into '4 cylinder mode'. Tach dropped about 2/3's, car ran like crap, figured it was the DIS, so I replaced the DIS with a new one. It started and ran just fine.

I drove it for a grand total of 2 days when suddenly the RPM's dropped, the car fought me to die (I tried to give it gas but it sputtered and died), and it wasn't able to restart. I thought maybe the new DIS was already bad, so I traded it under warranty for another. I installed the new DIS, but now it won't start. At all. It'll crank but won't start. I checked my grounds and they look okay as far as I know.

I did many a search and thought maybe it might be the CPS because it'll crank but won't start, but I'm not sure. Then again, I also thought it was the DIS because it went into 4 banger mode, and after I replaced it the problem seemed 'fixed', but then it went and died and won't restart anymore, even with another DIS. I even tried the old DIS, which would normally go into 4 cylinder mode, but it also doesn't work. The tach jumps to about 300 when it tries to start but just never 'catches.'

Does anyone have any insight on this before I go trading/buying parts again?

 

[spee-d]

do you have fuel pressure do you have spark.

 

[mrcow32]

I have fuel and I ensured that when I turn the key to on, I can hear the fuel pump priming.

Spark plugs and wires are new, tried swapping out the coil pack but that made no difference.

 

[spee-d]

sounds just like what i went through it ended up being the crank sensor so i just went and did a front 60k.

 

[mrcow32]

If you don't mind me asking, what were the symptoms/problems you were experiencing?

As stated above, I'm leaning toward the CPS, but I guess I wanted to be sure before I try to replace it. Thanks for the post, btw!

 

[spee-d]

random no start stall then not start then it would run 2-3 days then not start i ended up just doing a full 60k WAY TO MUCH MONEY.
cam sensor
crank sensor
water pump
timing belt & tensioner
valve cover gaskets
plugs & wires
cam seals
check adjustment on valves
clean the nasty dirty tank & runners
so i don`t know what sensor was the problem. the cam sensor is easy and inexpesive to replace.