86 900S loss of power from idle to 1st gear

Automatic or manual? First thing I'd do is clean the throttle body, also wouldn't hurt to clean out the idle speed valve.

it is Manual... have you seen this sort of thing before. It is so random.

it is Manual... have you seen this sort of thing before. It is so random.

I've seen similar problems caused by corroded grounds and other bad connections, intermittent problems are usually electrical.

I had a similar rough running/stalling problem early on with my '86 c900. After a few clueless mechanics replaced the injectors, and the rotor, a competent mechanic solved the problem by replacing the PCV (Positive Crankcase Valve?). It's run fine since then.

--Paul

All of the grounds and connections have been checked as that does make sense from an engineering perspective.

If anyone else has other ideas I am open to hearing them. At this point I am still going to replace the fuel pressure gauge, unless anyone is sure that is not the problem.

Thanks for your help so far

Taylor

What component are you referring to as the 'fuel pressure gauge'?

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My C900 has started doing this recently. First run of the morning, goes fine into gear, idles fine, clutch up, little gas, starts to move, and wants to stall, if I can hold it from stalling, it goes into fast idle (about 1200 revs for a minute or two), if it stall it goes to normal idle on restart and drives fine. Cleaned the AIC about 6 months ago, and the intercooler, throttle body and pipe work about 2 months ago. Guess the AIC needs a re-clean.

Maybe it is called the fuel pressure regulator, not guage. Or maybe I have two machanics who are pulling the wool over my eyes.

Taylor

It's gotta be, they don't have a fuel pressure guage, never seen a car that did.

The fuel pressure regulator is an easy item to test - it's not one where replacement is the only option. If your mechanic can't be bothered to test things like this then I'd seriously question their ability to repair your fault.

As for your original question - what is the condition of your ignition system?