Okay, back in august i bought my 88 fiero formula not running. Put a fuel pump in and the car fired right up and drove amazing. Yes it still had issues like high idle. I’ve fixed all the little problems over the months. I now have a bog after driving 800ft and the car shifts super early.

Here’s a list of what i’ve done. I’m lost at this point. Any sensors or parts that weren’t replaced tested good.

Fuel pump (has adequate fuel pressure while driving… 43psi)
Injectors
IAT
IAC
MAP
Smoke tested (fixed all leaks including EGR tube)
EGR delete
has no catalytic converter
CTS (ECM sensor)
All grounds
No codes on ECM
O2 sensor
Coil is in spec
Pickup coil is in spec
New timing chain and gears (ignition timing reset after)

Any help is much appreciated!

Has the transmission fluid and filter been changed?

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

quote Originally posted by fierokid88: New timing chain and gears (ignition timing reset after)

With ALDL jumper in place?

quote Originally posted by Patrick: With ALDL jumper in place?

Yes. Followed everything via service manual

quote Originally posted by fierokid88: I now have a bog after driving 800ft...

800 feet? Is that a typo?

quote Originally posted by Patrick: 800 feet? Is that a typo?

No unfortunately. It revs great in park. In drive, it will shift early, then after about 800ft it will just fall flat on its face and won’t move past idle speed without bog. Super confused as i’ve done everything i can with the car.

I can’t even get it 3 miles to my shop to get it on the lift!

Could be a TV cable adjustment issue.

Also could try disconnecting the TCC connector. It might be locking up the converter when it should not be due to a bad pressure switch.

quote Originally posted by fieroguru: Could be a TV cable adjustment issue. Also could try disconnecting the TCC connector. It might be locking up the converter when it should not be due to a bad pressure switch.

Still does it unfortunately.

It might be time to verify the timing mark on the balancer. It is know to move, so you could have set the timing correctly to an improperly positioned timing mark.

Of just add 10 degrees advance and take it for a spin to see if there is any difference. If not, put it back. It there is, then check the mark.