87 Turbo runs rough
 

My 87 Turbo has intermittently started rough for several years, but has always cleared up after 15-30 seconds of warm up and it usually ran smooth thereafter. Recently while on the freeway I noticed that when I accelerated a little, it had a rough vibration and was lacking in power. Since then it starts rough and remains rough. Under acceleration stress like starting off from a dead stop, it chugs. While idling at a stop and in gear (automatic), the roughness is amplified.
Does anyone have experience with of this type problem?
Thanks

Are there any diagnostic codes stored (if you don't know how to heck them look in the FAQ section)? Roughness at startup could be any of a number of things from a misfire to a minor knock due to loose bearing tolerances (doesn't mean they're bad, just old), oiling issues, or running too rich at startup (disconnect the cold start injector next time you start up and see if the stumble goes away).

Just because you've noticed one symptom over a long period of time it's no reason to assume it's related to the sudden, new, extreme problem.

Agreed, check for codes first as theres a few possible causes. It could well be the cold start injector/it's wiring if the problems are related. best way to really prove it out is to remove it's fuel feed (and blank off obviously!) as just pulling the connector doesn't account for a leaking tit, but definitely pull codes first off (while running as some like AFM disappear when its off) and check any result against-: http://www.cygnusx1.net/Supra/Librar...aspx?S=FI&P=26