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M12x1.25

The stock head bolts are pretty strong, but they have their limitations (as you found out). Given a choice between ARP bolts vs studs...I'd choose the studs, no question.

Any codes?

It's the wire in between that's of interest Bill ;) First thing I would check is the connectors...after that, it's a matter of tracing the wire. This assumes the TPS itself is good.

^^^ That's the right idea...big refund means you gave the Fed an intrest free loan month by month last year ;) Take the exemptions on the W4 and make more $$$ each month.

Doh!

Are your ECU grounds secured to the intake manifold?

LOL...that's funny Hommer. Did the same thing back in the day ;) 87mgte - I doubt you need a new head (unless there's another issue)...it looks like to me you mixed the lifters/shims up, here's what I would do: Take each one and go around the different valve bores till you find a fit. You...

Good for you man ;) This is one of those cases where a hammer is actually the appropriate tool. Once the ARPs go on, there will be no more messing with hex heads!

I assume you mean continuity between the TPS connector and the ECU connector. My '89 wiring diagram shows the wire as a blue w/ red stripe all the way to the ECU.

Ummm...I'm not sure what you mean by "cannot retard timing". It really needs to look like the pic I posted...that puts the tightening bolt at about mid point in the CPS securing slot. You are going to need +/- to get your base ignition timing correct.

Well, the TSRM directs you keep the lifters/shims in order when removed: http://www.cygnusx1.net/supra/Library/TSRM/MK3/manual.aspx?Section=EM&P=41 (I'm thinking there's a good reason for this) It also has a oil clearance spec for the lifter in the head...

Ok...so you're not going to tell us how you did it?

Basically you'll get Kelly BB for it. Unless you have special insurance for the value.

Well, there's your code 34 for sure ;) Fix both hoses and I'm thinking a lot of your problem will resolve. You do need to fix the code 41...most likely caused by VTA as JJ mentioned. That input to the ECU is used to increase injector volume at increased engine speed. I would check...

New TPS or used? Did you clear the codes after you replaced it? (could be a left over) That cracked accordion hose is allowing unmetered air past the AFM. Are the rest of your IC hoses in good shape w/ tight clamps? Think boost leak ;)

Didn't know we were talking about "your" problem ;) Especially the evil ones...LOL!

M22x1.5

If you do it like the TSRM says, that's the way it should look ;)

Ok...so the idle problem was corrected with plugs/wires correct? There is a ground from the coil pack plate already...it's a field ground and should not have anything to do with what you're getting now. If you want to replace it, just run a wire to an available bolt on the block or to where...