BigDom

So I found my 7th third gen if call it a NYC barn find (it was sitting in a parking garage for 10 years) so it hasn't started or moved in those ten years

We put in a battery and the engine cranked but wouldn't start we checked and figured the fuel pump was shot so we changed it and it started right up

Now it's running extremely rough when I press the gas it hesitates badly till 3k rpm and blue smoke is coming out of the exhaust at start and during revs

Also if I leave it idling it idles perfect but then shuts off and as off tonight it won't restart

It's a 350 with 50k miles

Any good ideas where to start?

tealman92

Injectors and fuel pressure regulator.

CatmanFS

Spark plugs, cap, rotor, air filter, fuel filter, fresh gas, clean battery terminals, clean everything. Change the oil, change the trans fluid, do a solid inspection and replace everything that's broken or needs it. Give it a shot, then you'll know if the problem is something like head gaskets, blown rings or something of that nature. Good luck.

Damon

Yeah, full tune up on both the fuel system and ignition. Hopefully the injectors aren't clogged up (they probably are after sitting that long), but do the easy stuff first. It needs it anyway. And you need to start eliminating what it CAN'T be to help you diagnose what it CAN be causing the rough running.

TylerSteez

iTrader: (3)

Do what everyone has said about the full tune up, then put premium gas in and run it for a while, that should clear what's clear able in the injectors. Sea foam the motor by sucking it through the brake booster vacuum hose will clean out some engine debris. The hesitation when revving is a sign of a bad maf sensor, they can be problematic and costly

Edit: is the computer pulling any codes?

Birdstheword

Don't forget the valve seals !

TylerSteez

iTrader: (3)

Also go over and replace all the vacuum hoses, they usually are the difference between a good running tpi and a horrible running aggravation