The 1.5L I just replaced ran fine but had loose rod bearing. There was no
RPM problem. The newly installed engine came with everything attached
(intake/exhaust manifolds, sensors, etc). Now at cold start-up the engine
revs to 1000 RPM and shortly later idles down to 750 RPM. Turn on the A/C
and it stays at 750 RPM. However, later when the engine is hot the RPMs
get screwy.

With clutch in or out it can fluctuate between 1000 & 1250 regardless of
A/C. Or it will stay at 1750 without A/C and drop to 1250 with A/C on.
Or it will sit at 750 regardless of A/C. Punching the accelerator will
result in it staying the same or changing to any of the other
combinations.

I pulled the new engines throttle body front end with all sensors and
valves and replaced it with the old engines front end, sensors and valves
since that unit had worked previously. There is no change. I cannot find
any vacuum leaks. I did not touch the idle speed adjust screw on top of
either front end. Is that really the idle speed adjustment screw?

I set the timing per the Haynes manual which says to put a jumper between
the TEN and GRND terminals on the test connector and set to 10 degrees
BTC. I noted that the jumper had no effect other than disabling the dash
tach to zero. Pulled the jumper and the timing did not change. Was I
supposed to see a change?

When it is warm it seems it does not get a good "power curve" feel in any
gear until 2000 rpm regardless of the amount of gas given. It feels heavy
or straining below that 2000 rpm. Is that to be expected with the 1.5L
w/5speed manual?

Is there another way I should be setting the timing (the jumper issue)?

How far should the accelerator cable wheel's tang be off of the TAS screw?
Or should it rest against the screw? I think I have heard that the TAS
screw cannot be adjusted by a layman but if I am wrong, how do I check it
or properly adjust it?

Are there any ideas for me to get this thing working right? I appreciate
any help I can get. Bill