97 150 Merc EFI problem

[crizzel]

So im having a problem with my motor.. WHen you first crank the motor everythings fine you can run wherever an its fine.. After the 1st run if you idle a little ways you can tell that the motor looses power if you hit the throttle it'll only get to 2000rpm an thats it.. IF you idle a little farter you can feel the motor get power again an you can get it on plane an all is good.. Sometimes when your running it will loose power for just a second an then it will regain it.. Motor compression is 130 on all cylinders. I had a guy look at it an put a brand new stator on it an he said it was fixed but guess what? Its not!! still doing it.. He also said the voltage was low on the passanger side an the now stator he put on fixed it.. He said he thought it was a power pack at first swaped it an it did the same thing.. So i think dude just doesnt know what the f hes doing.. Any help would be appreciated..

[bremenmarine1shawn]

i think u have a possible coil/wire/plug/or harness causeing u this problem.the only way 2 find it is 2 get it 2 do it and start testing.look at switch box harnesses closely u may find chafed wire,amd also look at any sharp point on block where wires may touch.this i have said doesnt include fuel system can cause same problems also!

[bhooper]

had a similar problem with my 97 150 efi and it was the tps sensor which is throttle position sensor.Just a thought

[crizzel]

What did The tps sensor cost?

[nitro85]

Gonna run you anywhere from $60 to $70 for the part crizzel. Just seen some last week.