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Check Engine

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1990 Ls 400 121k miles

I was on my way to work and had the cruise control set and noticed that it would jerk/hesitate every couple of seconds. but while accelerating it seems to drive fine. when I got to work the check engine light came on. prior to this it was having trouble accelerating....like I would have trouble climbing hills from a complete stop until it gets to third gear.it does idle a bit rough. I got it tuned up back in december and also had some seafoam tran through the fuel system.

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Well i finally took it to get a diagnostic and its got a code 13. They said its misfiring, some of the cylinders aren't firing, and that RPM signal open or short. Don't know what that means. Apparently my transmission needs a rebuild. That the ATF is contaminated with friction materials that have a burnt odor, ICC engagement is harsh and engine misfires and jerks under load.

So what do you guys think?

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Well i finally took it to get a diagnostic and its got a code 13. They said its misfiring, some of the cylinders aren't firing, and that RPM signal open or short. Don't know what that means. Apparently my transmission needs a rebuild. That the ATF is contaminated with friction materials that have a burnt odor, ICC engagement is harsh and engine misfires and jerks under load.

So what do you guys think?

Well I would get the engine mis firing and CEL code fixed before ripping out the tranny. That sounds a tad suspect. Along the lines of a service writer trolling for a high ticket repair. ATF will naturally contaminate overtime as friction disks wear out. Maybe a tranny fluid drain and replace would be next step after engine sorted out.

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After doing a couple searches it seems to come down to the camshaft sensor or the mass air flow sensor.

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Whatever you do, don't let them touch your transmission. Maybe when they did the tuneup, they left a wire against a manifold. Look for cheap easy things first, then work your way up.

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well it seems to bad gas. no more sputtering since.i started only using chevron.

but now there is another problem. my transmission is pouring transmission fliud out seemingly right after i took it to aamco transmission.for the diagnostic. it didnt even drip before this. you think theu may have did something? where could it be coming from

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