Who is good a trouble shooting?

[Philsnotfalling]

I'm hesitant to post this.

I have a 1990 chassis with a 95 ka24de. It is wired like a 95 and the ecu is a 95. Essentially the drive train is a 95. Mckinney motorsports did the harness for me about five years ago.

Two weeks ago on the freeway my car started bucking. I exited and called a wrecker as there was no obvious problem. Once here at the shop it still would run but had a bad miss. Kinda sounds like a timing problem (the timing was done about 40000 miles ago) but the timing is right on. I'm not getting a good spark accord to a spark tester. So far I've changed:

spark plugscaprotorno plug wires I have the magnecor and they ohmed out fineignition switchmass air flow sensorcrank sensorwalbro fuel pump (fixed one problem of 20psi fuel pressure)

I still have the bucking and misfire which gets worse as the rpms go up.

Any suggestions?

[Philsnotfalling]

Update from a few hours ago...

I've checked resistance, continuity, power supply on the camshaft position sensor, power transistor, resistor... about everything there is on the distributor. As well as the iacv, I even took that off and cleaned it . Everything checked out fine.

I swapped the ecu from another prefect running car. Still it ran like it had a miss.

Until... dun dun duuuuuuun...

My room-mate (also our shops only mechanic and fellow 240 owner) and I put a timing light on it. Wouldn't you know the light acted like the car ran, with a miss... sporadic if you will. From what the ecu said, the timing checked out fine with a scan tool so we didn't even bother looking at that.

Again, any suggestions? As of right now we think it is going to be the distributor... more specifically the cam position sensor inside the distributor.

[elithe240guy]

what about fuel injectors??I had a nasty missfire on my 91 years back and that is what fixed it.

[scottydog]

Pull the individual spark plug wires one at a time and see how it runs. The good cylinders will make it worse, the bad one won't make any difference.

I think you have a bad injector. Hecka easy to replace.

[Vegascorbin]

Read what he wrote. He has flackey spark as shown by the timing light.

I do not see where you have changed the coil. (or coil packs if so equiped. not familure with the 95)

[scottydog]

An obvious brain fart. My bad...

[Philsnotfalling]

The 95 has an internal coil on the distributor. Today I'm swapping distributors with another car just to see if that will fix it. If not then I'm very stumped.