Im getting a diesel sound at high rpms and even worse under load (up hill) and then a nice brownish cloud of smoke from the exhaust untill I shift

What is this?
valve float? spark knock?
HELP!!!

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1985 IROC-Z
TPI 305, 700R4 with shift kit, richmond 3.73's, auburn pro series posi, crane compucam 2030, ported plenum, gutted air boxes, all the little insignificant stuff.

 

check your ignition plugs,wires/cap/rotor.
May need a tune up. Also check timing.

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'91 Camaro 3.1 t-tops 44k original.
'98 GMC Sonoma excab 4.3 auto 35k.

 

All of those things are perfectly fine

this is a bit more complex than that.

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1985 IROC-Z
TPI 305, 700R4 with shift kit, richmond 3.73's, auburn pro series posi, crane compucam 2030, ported plenum, gutted air boxes, all the little insignificant stuff.

 

Sounds like it might be running too rich... restricted air filter? chip?

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"So many Mustangs, so little time..."
ICON Motorsports