So is this the one your talking about
Searched EC121 and this is what came up on this site.
Also, what Simulator do you have - 2004 or FSX , or FSX Gold/Acceleration ??
I don't have this particular Constellation , tho I do have 57 other Lockheed constellations , Just Flights and FSDZIGNS L-049A Lockheed Constellations, which are different than Manfred Johns versions.
FSDZIGNS Constellations :
http://simviation.com/1/search?submit=1&keywords=jetranger&x=22&y=8 Double check to make sure all the files are in the right places with your EC121 Download, sometimes that can cause your engine problem.
I looked thru that particular download and it appears according to the download that there are some definite starting sequences incorporated into that particular model.
another thing , did you actually download your EC121 Model from this site or another site
sometimes important files get left out of the upload process by mistake, and you may not have got all the files you were supposed to, happens sometimes.
I know another trick,,, explaning it may be more difficult,,,,,,
find another Manfred johns Constellation,,,,
get into the Aircrafts CFG File - copy only the Engine parimeters and paste them into the the current Aircraft CFG File that giving you the problem,,, don't forget to delete the current engine data tho,,,
or, you could take possibly ALL the Important Flight Data from another Manfred Johns Constellation,,, and copy that data below all your Aircrafts within the list of your current Constellation,,,, making sure to keep all your current liverys / paints you have now within that Aircraft CFG File.
Jetranger