the motor is true lt4 383 with all kinds of mods after spraying the motor at the car wash the car ran fine until it sat over night now it starts realy rough and when it does start and u stab the throtal it will stumble and and all most die the tps is fine any word of advice besides DONT SPRAY THE MOTOR OFF AT THE CAR WASH.

 

It's most likely that the OPTI or wires is the problem. Try spraying the plug wires from distributor to plug with WD-40....really drench them. Wait a while and see if the problem improves. The drench the opti cap with WD-40 and see if it helps. If the problem gets better by treating the wires, all you need to do is replace them. If you didn't see an improvement with treating wires but did with treating the opti you'll have to replace the opti cap and rotor at the very least.....

 

thanks will try that hope i didnt mess any thing else up

 

What year is the car? I had the same problem with automatic carwashes. I would let the car sit outside with the hood open in the sun for awhile and it would dry back put and run fine. Since I converted too a vented options I've had no more issues

 

Venting by itself doesn't fix this problem. Changing over to the new distributor brought along a new cap and rotor.....

The distributor cap, rotor and wires are maintenance items that get terribly overlooked. If this was a car with a traditional distributor, the first thing people would recommend would be to change out the cap. Same thing here...just a unique location.....

 

Check the Opti harness connector for corrosion, damaged pins. Scan it for codes.

 

scaned for codes and all that came up was egr cir malfunction no egr on the car just the control sin the motor is in a 97 fire bird and the old wireing harness fromlt1 was used

 

true lt4 383 in a97 bird day after i had sprayed the motor off the started realy rough it took a long time and when it did start it ran like crap almost like the tps was shot but reads just fine on a diog scan and the egr cir malfuntion the egr is blocked off and wireing harness is the org from the lt1

 

sounds like the classic opticrap :/

 

and u prolly dont want to start a new thread on the same topic...

 

to replace go with oe or aftermarket and is it apain like everyone talks about

 

i went through this about 2 months ago. i asked just about the same questions as you. the answers i was given were go oem wit an ac delco, or a delphi. some suggested the msd unit, but then again ppl have had problems with those as well. some words of advice i found really helpful were "you get what you pay for". i went with a delphi unit off ebay for 350 bucks i think with a 3 year warranty. i've put about 3k on the new opti, and its been runing great. i had some other problems that i thout my have been the opti, but truly werent. theres a thread here abot properly diagnosing a bad opti. make sure u go through that before deciding to change yours out. is it a long and time consuming process? yes. is it hard? not terribly, especially when you have friends that can help you out. there are also plenty of write-ups out there on all the dos and donts of an opti install. good luck man!

 

long and time consuming the first time around**. i know the experienced guys could probably get it all done in half the time it took me lol

 

You might get lucky, and the opti will dry and be OK.

 

The is getting totally out of control. Two virtually identical threads on the same question, posted in the same day is NOT a good idea.

I'm going to merge the two threads.

In the future, post the question once. If you don't have a response AFTER 24 HOURS push the thread back to the top by posting a message "TTT".