305 to 350 conversion

Its a 1987 with throttle body fuel injection, 4 spd automatic, California
car.
The ECM lists as same part number for both the 305 and the 350... but
different EPROM's.
All other parts from the 305 bolted right on the 350, including the intake
and throttle body.
Can't find any vacuum leaks. All sensors check out OK. Rebuilt the
distributor. Replaced the knox sensor and the idle air control valve...
nothing seems to help.

What I really need is to find someone that's done this conversion before...

"patricktee" wrote in message

> On Sat, 10 Dec 2005 11:20:09 -0800, "dtrmn8r"
> wrote:
>
>>Just swapped out a 305 for a 350 in my '87 Chevy van... won't idle, though
>>it drives great. I now suspect I need to change the EPROM in my ECM. I
>>need
>>help finding sources of information on this. Are dealers out there that
>>program eproms for you??
>>
>>help, help, help
>>gary
>>
> You don't say what year but before you go through that expense, I
> would make sure you have no air leaks. Is it going to both open and
> closed loop now?
>
>
> "But now is the time for the younger men to lock in rough encounters,
> time for me to yield to the pains of old age. But there was a day I shone
> among the champions."
>
> Homer, The Illiad, 23.715-719 (800 BC). King Nestor of Pylos.
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