I have 2 HPI Nitro star .15FE's I'm trying to use I got them both with old HPI MTs I bought.

the 1st one runs fine when throttle is low but once I open the throttle past 75% it it dies out.

The 2nd will turn over but will die out almost immediately after I remove the glow plug igniter and is very hard to restart. I also have to have the throttle open over 30% of the way to get it to start. I've JUST got this engine and have not had much time for it due to rain on almost every day I could work on it.

Both are using brand new MC-9 glow plugs. Both glow plugs start up my HPI Nitro Star .15 in under 1 second (rotostart).

So does anyone know what kind of issues these 2 could have?